WFRP 4e GM Guide: Sessions, Scenarios, NPCs, Corruption, and Insanity

Introduction

A WFRP 4e GM's core job is not to protect a plot from the players. It is to put a living Old World problem in front of them clearly enough that they can make real choices, then show the consequences with energy and fairness. You do not need to predict every choice. You need a reliable way to respond when the choices arrive.

This guide covers that craft in the order you will need it: a session workflow from recap to changed circumstances, scenario design, NPC creation, and social encounters. It finishes with the two rules areas GMs ask about most, Corruption and the Psychology rules that stand in for "insanity." The rules sections summarize the Core Rulebook's procedures and numbers. The book remains the authority for Tests, combat, travel, conditions, NPC statistics, and the full mutation tables.

Hot Take

Most GMs treat Corruption as their weapon. The rulebook quietly hands it to the players: dark deals are "always a choice for you, not the GM," and dark whispers can be refused. The strongest version of the mechanic is a player spending a point on a reroll to save a friend, then agreeing a session later to let a cultist walk free to shed it. If your Corruption totals only ever rise because of surprise exposure rolls, the mechanic is doing bookkeeping. Warn loudly, offer the deal openly, and let the table argue about whether one more chance is worth it.

Session Workflow

A session gets easier to run when it follows a clear rhythm: establish a problem, listen to what the players want to do, resolve consequences fairly, and let the world move in response.

Build Situations, Not Scripts

Start with a local problem that would get worse without the party. Give it a visible surface, a hidden cause, and people who want incompatible things.

For example, a riverside inn is losing customers after several barges fail to arrive. The visible problem is empty tables and anxious workers. The hidden cause might be a dispute, a crime, a dangerous stretch of river, or someone profiting from the delay. What matters in preparation is not a correct sequence of scenes. It is knowing what the innkeeper, barge master, watch officer, and frightened deckhand will do if the party speaks to them, ignores them, or makes the situation public.

Improvisation gets easier this way, because you react from established motives instead of trying to push the players back onto a path.

Prepare Five Answers Before the Session

Keep preparation small enough that you will use it. Before play, answer these five questions on a single page:

1. What problem is visible right now?
2. Who wants the problem solved, hidden, delayed, or made worse?
3. What changes if the party does nothing?
4. Which two locations or people can give the party a useful lead?
5. What event can arrive if the session needs momentum?

For a muddy Reikland town, that might be a missing coach, an anxious merchant, a watch officer protecting the town's reputation, an innkeeper who heard an argument, and a delayed barge that finally arrives with the wrong cargo. You do not need to decide what the party will do with those facts. Their choices will shape the session.

Add one more question before the first scene: which quieter character has a likely opening in the first hour?

Open With a Recap and an Invitation

Open with a short recap in plain language. Name what the party learned, what remains unresolved, and which consequence is closest to arriving. Then describe the current place with one or two concrete details and end with an invitation to act.

"Rain has turned the market square to brown water. The missing coach still has not arrived, but its driver is standing at the watch house door, shouting that the cargo was never his. What do you do?"

That opening tells players where they are, what changed, and why they should engage. It avoids the slow start where everyone waits for the GM to reveal the correct first move. Other openings work the same way: a missing person has not returned, a market argument is becoming a crowd, an employer has a sealed letter and a deadline, a familiar face wants a private word before the watch notices. The party does not need to know the whole adventure, only enough to take a first action that matters.

Listen Before Advancing the Plot

When players react, let their actions matter before the next prepared event arrives. Ask follow-up questions that clarify intent: "Are you trying to calm the driver, get details, or keep the watch from taking them away?" Then decide whether the action succeeds in the fiction, needs a Test, or leads to a larger sequence.

Player ideas will often be stranger than your notes. A surprising plan shows the group is engaging with the situation, so let NPC motives and pressures respond to it instead of treating it as an error to correct.

When a scene slows, add a new fact, a choice, or an approaching consequence. Do not add noise to punish discussion. The pressure should grow from the situation you already set up.

Call for Tests When the Result Changes Something

Ask one question before any roll: would success, failure, or a mixed result send the scene in different directions? If a character's routine expertise can handle something with no interesting obstacle, say yes and move on. If failure would only stop play, change the situation so failure brings a cost, clue, delay, or complication instead.

Tell players what an attempt risks before rolling when their characters could reasonably see the risk. In a game where a fight, a suspicious official, or a dangerous road can reshape the session quickly, that warning matters.

Make the result visible. Do not only say "You failed." Say what happened, who reacts, and what option remains.

Use Rulings to Protect Pace and Trust

WFRP has detailed rules because details matter when the stakes are real. It also needs a GM who can make a fair call when the exact page is not at hand.

State the ruling, explain the visible reason, and move the game forward. If a player questions it, listen briefly, make the call for the current scene, and agree to check the rule after play. Consistency matters more than pretending every answer was obvious.

Share the Spotlight Deliberately

The loudest player does not need to carry every scene. At regular intervals, look for someone who has not had a meaningful choice and give them a prompt tied to their character, not a vague request to join in:

• "Your character grew up around warehouses. What looks wrong about this loading list?"
• "The crowd is getting ugly. Where do you position yourself?"
• "You know the local faith. What would make this shrine keeper listen?"
• "The guard is watching the door. What does your character do while the others talk?"

Build obstacles with more than one way in. A locked office can involve a practical tool, a social favour, a missing key, a guard's routine, a legal pretext, or a route across the roof. The party's careers and histories should make different options attractive instead of decorating character sheets.

Use Travel to Change the Campaign's Texture

Travel does not need a full encounter every time. A few sentences of weather, tolls, river traffic, and tired conversation can show distance. When you do add an event, give it one job: foreshadow a threat, reveal a piece of the Old World, create a decision, or let the party rest.

Pick events that belong to the journey underway. A coach road can bring a broken wheel, a toll dispute, a worried passenger, or bad news from the next settlement. A river trip can bring a stranded barge, an awkward cargo, a storm, or a crew that has heard a dangerous rumour.

The event should leave a trace. A helpful traveller becomes a later contact. A strange delay explains a late arrival. A worrying sight prepares the table for trouble ahead.

Keep the Old World Grounded

The setting feels strongest when large dangers touch ordinary life. A rumour matters because it can cost a labourer work. A road closure matters because merchants need the coach. A corrupt official has frightened subordinates, ambitious rivals, and paperwork that can open new opportunities.

Use sensory detail sparingly and specifically: wet wool, bad ale, river mud, a polished door handle in a poor street, a sudden silence when a uniform enters. One concrete detail usually does more than a paragraph of misery.

Keep Safety and Tone Explicit

WFRP can include horror, violence, poverty, prejudice, disease, and betrayal. Never surprise a player with content they did not agree to explore. Ask the group what to avoid, give a private way to raise concerns, and change course without demanding an explanation. The Corruption and Insanity sections below lean on this conversation heavily.

Vary the tone, too. Let grim pressure sit beside warmth, absurdity, generosity, and small victories. A miserable setting becomes more compelling when the party can see what is worth protecting.

End Each Session With Changed Circumstances

Close by naming the concrete change: an ally gained, a suspect escaped, a debt incurred, a route opened, a threat made public. Then ask the players what they intend to pursue next.

Their answer is your best preparation for the following session. It tells you what they care about, gives you an opening scene, and lets you prepare consequences that come from their choices instead of an unseen script.

Scenario Design

A strong WFRP 4e scenario is a problem in motion, not a plot the party must discover correctly. The Core Rulebook's Gamemaster chapter advises preparing events and people while leaving room for players to take unexpected paths. In the Old World, the trouble usually starts small: a missing wage packet, a blocked river landing, a frightened witness, a disputed delivery, or an official who wants a matter to disappear before market day.

The Four-Part Scenario Frame

Use this frame for a one-session problem or the opening of a longer arc. Write one or two sentences for each part.

Imagine a district where a cooper's apprentice vanishes on the morning a valuable shipment is due. The visible trouble is the missing apprentice and a workshop that cannot keep its promise. The agendas might include an employer worried about a ruined reputation, a rival who benefits from the delay, a family member hiding an embarrassing detail, and a watch clerk who wants the complaint closed quickly.

The scenario needs no prewritten answer. The party may search the workshop, ask around the dock, protect the shipment, negotiate with the employer, or decide the apprentice's safety matters more than the contract. Your notes only need to say how each person responds and what the situation does next.

Start With Trouble That Has a Human Cost

"There is corruption in town" is background. "The baker's daughter is being blamed for a fire she did not start, and the watch plans to take her away at dusk" gives the table people, a deadline, and a decision.

Pick a cost that touches ordinary life:

• Work stops, wages vanish, or an obligation cannot be met.
• A family, neighbourhood, trade, or shrine loses trust or safety.
• A public accusation threatens someone before the facts are known.
• A journey, delivery, or gathering becomes dangerous at the worst moment.

Then make the stakes legible. Players should know what their characters can see, what they are being asked to care about, and what may change before they have every answer. Mystery is good. Confusion about why anyone should act is paperwork with fog effects.

Give Every Important Person an Agenda

For each NPC who can influence the scenario, note what they want now, what they fear becoming public, and what they will do if the party ignores them.

These are roles to fill. Replace them with people who belong in your location, and use the NPC Creation method below to give each one a face.

Build Leads as Doors, Not Keys

Do not lock the scenario behind one successful conversation, one hidden object, or one exact interpretation. Prepare several doors into the same developing situation, each offering information, a bargaining chip, access, or a new decision.

For the missing apprentice, a workshop ledger might show a disputed delivery, a dockworker may know where the apprentice went after work, and the neighbours may have heard a private argument. None holds the complete answer. Together they let the party choose what to pursue and draw sensible conclusions.

When a lead is missed, move its information instead of halting the session. Someone may volunteer it under pressure, a consequence may reveal it, or another location may hold a different version. Do not hide your preparation behind a single roll. Let the party decide what they will risk to learn more.

Escalate the Situation, Not the Punishment

Pressure should grow from established circumstances, not appear because the party took too long to read your mind. Use a three-step ladder:

1. Warning: a deadline is named, a witness gets nervous, or a suspect prepares to leave.
2. Change: someone acts, evidence is moved, a public dispute starts, or a useful route closes.
3. Reckoning: the party must decide what cost, alliance, exposure, or danger they will accept.

Advance one step when the party delays, when an action creates a new complication, or when the table needs a fresh decision. Do not advance it every few minutes. Give players room to pursue a plan and see its effects.

Failure can move the story too. A failed attempt to question an official may make them defensive but reveal which name makes them nervous. A failed attempt to stop a delivery means the cargo arrives, which makes the next scene harder but still playable. Your notes should focus on what a result changes.

Decide What Success Can Look Like

List two or three outcomes that count as real progress, different in method and cost:

• Clear an innocent person, even if the culprit escapes for now.
• Protect the vulnerable party, even if the delivery is lost.
• Expose the scheme publicly and damage a useful local relationship.
• Make a compromise that buys time but creates a debt.

This stops you treating one conclusion as the only real ending, and it gives the party a reason to argue about values instead of only asking which door hides the next clue.

A Compact Scenario Loop

At the table, the scenario runs as a repeating loop:

1. Visible trouble.
2. Player choice.
3. Consequence, resolved in the fiction or with a Test when uncertainty and consequence matter.
4. New information or pressure.
5. Another player choice.

Open in motion and repeat until the party has changed something important. If a scene stalls, ask a specific question: "The watch will arrive before sunset. Do you want to find the apprentice, protect the family, or learn why the shipment matters?" That usually beats a sudden fight with suspiciously perfect timing.

NPC Creation

The best WFRP 4e NPCs do not need a biography, a prepared speech, or combat statistics before they matter. The Core Rulebook's advice is to prepare the people involved in an adventure, and it notes that "a single feature - an accent, catchphrase or tic - helps make everyone memorable." Start there, then give the person a motive that can react to player choices.

The Four-Note NPC Method

Write four short notes, before the session for likely contacts or during play when someone unexpected becomes important.

Those notes are enough to run an interview, a negotiation, a warning, or an argument. If the party returns later, add one line about what changed since the first meeting.

Start With a Job, Not a Secret

A person's place in daily life tells players how to approach them. A boat hand knows the river schedule. A parish clerk cares about records and reputation. A tavern owner notices who pays, who avoids the door, and who caused trouble before. A guard has a shift to finish, an order to follow, and a sergeant they do not want to disappoint.

The party needs to understand why someone is present before deciding whether to ask, bargain, observe, threaten, help, or walk away. Secrets can surface when they create a new decision. Not every shopkeeper needs a trapdoor and a mysterious cough.

Give the NPC a Motive That Survives Improvisation

Write motives in active language: protect a sibling, avoid a fine, keep a promise, gain a better position, hide a mistake, recover a lost item, stop an argument going public. When the party does something unexpected, ask how it affects the motive.

This keeps the NPC from feeling like a locked information cabinet. They have reasons to cooperate, resist, mislead, or change their mind, and the dialogue can come at the table because the direction is already set.

Make Details Playable

Choose a detail players can hear, see, or notice in the first minute. It should suggest mood without replacing motive.

• Keeps wiping rain from an already dry counter.
• Speaks with practised politeness until a particular name comes up.
• Has ink-stained fingers and checks the doorway before answering.
• Treats every visitor as a possible customer.
• Carries an item tied to a job, family, or unfinished obligation.

Do not turn the detail into a riddle. "Always checking the back room" signals worry, but the NPC still needs a practical reason to worry, and the party should learn it through action and consequence.

Decide When NPCs Need Statistics

Most locals only need clear fiction: what they know, want, and can offer, and what they will do next. Give an NPC full mechanical attention only when they enter a situation where exact rules matter, such as an Opposed Test, a fight, or another Core Rulebook procedure.

That protects pace. You do not need to stop a tense conversation to work out every passerby's capabilities. If the baker becomes an ongoing ally or rival, develop the relevant numbers then.

Build a Small Relationship Web

Before a session, connect three likely NPCs with one sentence each, mixing cooperation and friction:

• The innkeeper owes a favour to the boat hand.
• The boat hand fears being reported by the watch clerk.
• The watch clerk needs a quiet outcome from the innkeeper.

Now any player choice moves the situation. Helping the boat hand strains the innkeeper's position. Pressing the clerk makes the debt more important. The party is not steered toward one conversation. It chooses which relationship to disturb, and the Scenario Design frame above connects those people to visible trouble and rising pressure.

Let NPCs Change Their Minds

An NPC should not become loyal because the party rolled well once, and should not stay hostile because you wrote "hostile" in a margin. Evidence, risk, kindness, humiliation, debt, and self-interest all change what they will do. At the end of a scene, write one update:

1. What does this person now believe about the party?
2. What do they want to do before the party sees them again?
3. Who else will hear about this interaction?

Those updates turn a recurring character into a consequence of play instead of an actor waiting backstage for a cue. An NPC who wants to finish a shift, protect a relative, and avoid public embarrassment is often more memorable than a dozen extravagant voices, and more fun than learning the fishmonger was the mayor's identical twin all along.

Social Encounters

A WFRP 4e social encounter is not a single Fellowship roll between the party and a locked plot door. People want different things, social position shapes the room, and a question, favour, rumour, threat, or piece of evidence can change what happens next. The Core Rulebook supports this with social Skills, Opposed Tests, and Status. Before the dice, give the party enough to decide who speaks, what they can offer, and what they will risk.

Build the Conversation Around Two Wants

Write one line for each side before the scene:

Neither side needs to be secretly evil or perfectly reasonable. Each needs a reason to say yes, no, later, or "not unless you give me something first."

When players make a plan, ask what changes the official's calculation. A favour? A threat explained? A shared interest? Evidence? An appeal to procedure? The answer tells you whether the action works in the fiction, calls for a Test, or needs a different approach.

Match the Skill to the Approach

Social scenes go flat when every plan becomes Charm. Let the player's stated method pick the Skill.

The exact Test type, opposition, and modifiers are in the Skills chapter. Do not pick a Skill just because it is the party's highest number. If a player wants to use something else, ask how it changes the other person's decision. A good answer can reveal an approach you did not expect.

Let Status Shape the Room

Status is a real social force in WFRP 4e, and the book gives it numbers. In most circumstances, a character of a higher Tier gains +10 to Charm Tests influencing someone of a lower Tier, and a lower-Tier character suffers -10 influencing a higher Tier. On Leadership, being one Tier higher than the target gives +10, and two Tiers higher gives +20. The GM may also apply the Charm modifiers between different Standings in the same Tier, "but this is rarer."

The book also makes room for exceptions. A target who "Defies Status" ignores the modifiers, and one with "Extreme Views" may reverse them. A character who goes incognito is "typically" treated as Brass 3. So use Status as context, not an automatic "no." Ask three questions:

1. What does this place expect from someone of the party's apparent Status?
2. Is the target invested in those expectations, indifferent, or hostile to them?
3. How can the party change the context: credentials, a respected ally, expertise, a private meeting, or going incognito?

A low-Status character may struggle to command a magistrate in public but win a private hearing through neighbourhood knowledge. A high-Status character may get an easy audience and attract scrutiny, obligation, or a rival's attention with it. Status should create different routes through the scene, not one route for important people and a locked cellar for everyone else.

Run the Scene in Three Beats

This structure keeps a conversation moving without forcing it into combat rounds.

Opening position. Set the mood and the immediate obstacle: the official is busy, the tavern owner is wary, the guild representative is offended, the crowd is already listening. End on a question: "The clerk says the records are closed for the day. What do you offer to reopen the matter?"

Exchange of offers. Let the party try an approach and resolve it in the fiction or with the right Skill. Then show what the target wants in return, what new concern appears, or what the party learns. A successful social Test changes the person's behaviour. It does not overwrite their personality.

Changed terms or consequence. End the beat with a new situation: conditional access, a public refusal, an owed favour, a price, a warning, a spreading rumour, or someone else learning the party asked questions. The next choice carries weight even if the first attempt failed.

Make Social Failure Expensive, Not Terminal

If a failed Test only means "the NPC tells you nothing," the table will keep rolling until it gets boring. Give failure a change of state.

The outcome should follow from the person and place you established, which keeps the investigation alive without demanding a perfect roll.

Give Quieter Characters a Way In

Not every social contribution is a speech. A practical career can spot an altered seal, recognise a trade custom, notice a bad repair, or see why a delivery schedule is impossible. A watchful character can note who flinches at a name. A companion can work the bystanders while the negotiator holds the official's attention.

Invite those contributions directly: "While the clerk explains the rules, what does your character notice about the ledger?" The whole party gets something to do, and the group gains more bargaining power than one charismatic character can carry. The cleanest social success is rarely "they agree with everything." It is "they agree to see the evidence, but now their rival knows you are here," which keeps the clerk a person and not a vending machine for plot coupons.

Corruption Rules

Corruption points track "the slow, gradual slip of your soul to the Dark Gods of Chaos" (Core Rulebook, p. 182). It is not ordinary stress, bad luck, or a punishment for a bold plan, and the rules give it real teeth. Use it when the fiction sets up a real threat, and make sure players know the danger before their characters learn that the glowing green rock was not a paperweight.

How Characters Gain Corruption

The book names "two primary routes": dark deals and corrupting influences.

Dark deals. When an important Test fails and you have no Fortune left, or the reroll failed too, "you can purposefully choose to take a Corruption point to reroll a Test, even if it has been rerolled already." The book is explicit that this "is always a choice for you, not the GM," though the GM may gently remind the player it exists. Save it for moments with a visible cost: a failed attempt to pull someone from a burning warehouse, stop a dangerous arrest, or keep a secret from going public. A routine Test to dodge a minor inconvenience does not need a whisper from the abyss.

Corrupting influences. Exposure to "a place, person, or object tainted by Chaos" calls for a Challenging (+0) Endurance Test or a Challenging (+0) Cool Test, at the GM's choice. Physical influences are usually resisted with Endurance and spiritual ones with Cool. Stronger influences need more SL to escape cleanly:

The book lists more examples for each band on p. 182, including giving in to despair, rage, or excess at the minor end.

Telegraph the Danger Before the Roll

The book's own sidebar, "Be Very Careful," warns that points "can accrue very quickly" with groups new to the Old World, and that "it's important new players are cautioned when their actions may lead to corruption." Give a readable signal first and, where it fits, a chance to respond.

Do not over-explain the hidden cause. The party should know enough to make a decision more interesting than opening a door because the GM paused for effect.

Track Corruption in the Open

Track points alongside other lasting consequences, say when they change and why, and remind players which threshold matters. That makes the choice to investigate or take a dark deal tangible, and it stops the same fictional danger being treated differently next time.

Note the source of each point. "Touched the shrine's silver key" tells you more about the campaign than a bare total, and it hands you later scenes: an expert to consult, a risk to avoid, an argument about whether the key is worth keeping, or someone else noticing what the party carried away.

Thresholds, Mutation, and Falling to Chaos

The core threshold is short. Should a character "ever gain more Corruption points than your Willpower Bonus plus your Toughness Bonus," they immediately attempt a Challenging (+0) Endurance Test. On a pass they hold off for now, but must Test again the next time they gain points. On a failure, body or mind mutates (p. 183). The Pure Soul talent lets a character take extra points, up to their level in it, before testing.

When mutation happens, the character first loses Corruption points equal to their Willpower Bonus, then rolls percentile dice on a species table to see whether body or mind changes, then rolls on the Physical Corruption Table (p. 184) or the Mental Corruption Table (p. 185). Elves always roll on the mind result. There is a hard end as well: a character with more mutations than their Toughness Bonus, or more mental corruptions than their Willpower Bonus, has fallen to Chaos and becomes a GM-controlled NPC.

Treat that as a campaign event, not a random-joke generator. Before it can happen, agree how much body horror, loss of control, and character retirement the group wants. A mental corruption is a fantasy-horror mechanic, not a portrait of real mental health, so keep table language respectful. The book's "Slow Manifestations" option lets a mutation begin "as an itch, patch of flaky skin, or a new tic" before it fully shows, which turns a sudden exit into an ongoing problem: who notices, who helps, what can be hidden. The book also notes that "mutation is effectively a death sentence if discovered," so give those practical questions weight.

Losing Corruption: Dark Whispers and Absolution

Beyond mutation, the book gives two routes to shed points (pp. 183-185):

• Dark whispers. The GM may ask to spend one of a character's points to twist their actions, with examples such as "letting an enemy escape," "'accidentally' shooting an ally," or "falling asleep on watch." The player decides. Agreeing removes 1 point; refusing keeps it.
• Absolution. "Simply asking forgiveness from a local preacher won't be enough." The GM sets what is required, and it "is rarely, if ever, simple." The book suggests destroying an unholy artefact, joining a holy order, cleansing a profane temple, or completing a pilgrimage that ends in a high priest's blessing.

Make absolution playable. Set out the requirements openly enough that players can decide whether to pursue them, and let the attempt create an obligation, journey, sacrifice, or confrontation that belongs to your campaign.

Corruption Scene Checklist

1. Is the source of Corruption present and clear in the fiction?
2. Have players had enough warning to choose?
3. Is this Minor, Moderate, or Major exposure, and is it an Endurance or a Cool Test?
4. Will the result add a consequence, or only punish curiosity?
5. Does the scene stay inside the group's agreed horror limits?
6. If points change, what choice or relationship changes with them?

Insanity Rules

WFRP 4e has no separate insanity track. People searching for "WFRP 4e insanity rules" need the Psychology rules (p. 190-191), plus the mental corruptions described under Corruption Rules. At the table, name the specific element: Fear, Terror, a Psychology trait, a custom trauma response, or a mental corruption. A real person is not a game mechanic, and the rules should never be used to mock disability, treat mental illness as villainy, or push a player into material they did not agree to.

How Psychology Tests Work

When a character is exposed to a Psychological trait, they may resist by "passing a Cool Test at the beginning of the Round, with the Difficulty set by the GM." A success "lasts until the end of the current encounter, although additional Tests may be required if circumstances change." Under the common traits (Hatred, Animosity, Prejudice), a failed character may try again at the end of each later Round to shake the effect.

A short sample of what those traits do, from p. 190:

• Hatred: the character will not socially interact with the target and, if the Test fails, must try to destroy them, gaining +1 SL on combat Tests against them.
• Animosity: even on a pass, -20 to Fellowship Tests toward the group; on a failure, the character attacks them socially or physically.
• Prejudice: even on a pass, -10 to Fellowship Tests toward the group; on a failure, the character "must immediately insult the target of your prejudice. Loudly."
• Frenzy: entered by choice with a Willpower Test; the character is immune to other psychology but must charge the nearest enemy, and becomes Fatigued afterward.

Fear and Terror

Fear and Terror make a threat feel different from an ordinary opponent. The rules:

• Fear (Rating). Overcoming Fear is an Extended Cool Test: the character must reach SL equal to the Fear Rating, testing at the end of each round. Until then, they suffer -1 SL on all Tests to affect the source, cannot move closer without passing a Challenging (+0) Cool Test, and must pass a Challenging (+0) Cool Test or gain a Broken Condition if it comes closer.
• Terror (Rating). On first encountering the creature, make a Cool Test. On a failure, gain Broken Conditions equal to the Terror Rating plus the SL below 0. Either way, the creature then causes Fear at the same rating.

Before the roll, show what the character perceives: a presence that unsettles, a sight that overwhelms, a danger that closes a familiar route. Then state the practical stake: can they approach, are they at risk of breaking, will the party need to cover them?

Custom Psychology Traits Start as a Conversation

The book lets groups create traits "to reflect the events of your game," and adds that this "should be treated sensitively, and if in any doubt avoid anything that could upset a member of the group." Its examples include Phobia, treated as Fear 1 (higher for a strong phobia), Trauma (nightmares, flashbacks, or Animosity, Hatred, or a Phobia tied to the event), and Love, which grants immunity to Fear and Intimidation while defending loved ones. The GM is "the ultimate arbiter," and playing these traits well can earn extra XP.

Agree on these points with the player before a custom trait enters play:

1. What fictional trigger brings it into a scene?
2. What visible behaviour or game effect should it create?
3. What content stays off-screen, is softened, or is avoided?
4. Who can invoke it, and can the player revise or retire it later?
5. What supportive, heroic, or practical choices remain when it appears?

A good trait works as a roleplaying prompt the player can use. "Freezes when trapped in a burning building" can lead to a rescue, preparation, or a moment of trust. It should never oblige a player to perform distress for the table.

Separate Fictional Prejudice From Player Behaviour

Animosity and Prejudice describe fictional pressures in a harsh setting. They do not excuse harm at the table. Do not require slurs, do not let a trait target another player, and check in before using themes of identity, persecution, or real-world parallels. Turn a triggered trait into a bounded action instead: a tense refusal, an ill-judged accusation, an attempt to leave, or a moment the character must fight down.

Keep Player Agency Visible During Psychology Effects

Psychology can prescribe or restrict actions. Apply it as written, but do not let it become a vague order that takes over the scene. Explain the limit, then ask how the character acts within it. A character who cannot approach can still warn an ally, find cover, protect an exit, or keep testing to overcome the effect.

Give other players something constructive to do as well. A companion can keep watch, offer a reminder of the plan, find a safer route, or take on the dangerous task. Courage does not require fearlessness, and a frightened character can still contribute through preparation, trust, or the decision to come back when it matters. If an effect removes a character for a while, keep the player involved with observations and choices. Horror works better when the group is tense together.

Psychological Pressure Checklist

1. Is the trigger clear in the fiction before any rule applies?
2. Has the group agreed this kind of content is welcome?
3. Which procedure applies (Fear, Terror, a trait, or a mental corruption), and what does it change right now?
4. Can the affected player describe the response in their own words?
5. What support, alternative action, or choice remains?
6. Should you pause, fade out, revise, or move on?

Continue Your WFRP 4e GM Resources

For the basic player-to-GM procedure, read How To Play WFRP 4e. For the player-facing system overview, return to the WFRP 4e Guide Hub, or browse the full collection at WFRP 4e Guides. If you want a GM or group for a new campaign, browse games and Gamemasters on The Role Players Guild.

Where To Go From Here

A scenario needs somewhere to happen. The WFRP 4e Lore Guide supplies the Reikland detail, the gods, and the factions worth stealing for a session. Once the trouble you designed turns violent, the WFRP 4e Combat Guide has the Round procedure and the retreat rules your NPCs should be using too. And when one of those NPCs casts, the WFRP 4e Magic Guide covers Channelling, Miscasts and the reasons a village reacts badly to any of it.

Source Scope

This guide draws on the WFRP 4e Core Rulebook's Gamemaster chapter (preparation, people, improvisation, fair consequences), Class and Careers chapter (Status effects), Skills chapter, and Rules chapter sections on Corruption (pp. 182-185) and Psychology (pp. 190-191). The session workflow, scenario frame, NPC method, social scene structure, examples, and checklists are original. It summarizes rules and quotes short phrases but does not reproduce the mutation tables, full exposure lists, Skill entries, published scenarios, NPC statistics, maps, or handouts. Consult the Core Rulebook for complete rules and options.