Introduction
The best Summoner spells have a defined job. A Summoner is a spontaneous Charisma caster with a deliberately tight repertoire, an eidolon that determines the tradition, and link spells that compete for the same attention as ordinary spell slots. Every spell needs a job on the shared turn.
Start by deciding what the eidolon does when magic is not the answer. A front-line eidolon wants spells that solve distance, danger, and bad positioning. A more remote eidolon can lean harder into control, information, and the gaps in the rest of the party. The Summoner class guide explains the shared action economy; this page turns that constraint into a spell plan.
The Spell Plan in One Minute
| Resource | What it is for | The practical question |
|---|---|---|
| Cantrips | Reliable contribution when a ranked spell is not worth the slot | Does this work when the eidolon is already in the right place? |
| Repertoire spells | The limited answers you want ready every adventuring day | Which encounter problem does this solve better than a cantrip or the eidolon's normal turn? |
| Link spells | Partner-specific tools, including the link cantrip and Focus spells | Is spending a Focus Point better than saving the eidolon from the next bad exchange? |
| Eidolon magic | Feat-granted spells the eidolon can cast for itself | Does the eidolon need an action that the Summoner cannot spare? |
| Items | Narrow tools that keep the repertoire from carrying every contingency | Is this useful often enough to deserve a permanent known spell? |
The answer should be visible on the character sheet. If two spells both say "this might help," keep the one that changes a fight, a route, or a negotiation in a way the rest of the team cannot already cover.
Start With Repertoire Pressure
At 1st level, the class begins with five cantrips and one 1st-rank spell. It gains a spell when it gains access to a new rank, and its spell slots eventually reach two at each rank through 9th. That gives the class options across a career, but not room for every generally good spell.
Treat the repertoire as a small field kit.
| Priority | What to keep | Why it earns a place |
|---|---|---|
| First | A repeatable default | A cantrip or low-cost option that remains useful when the eidolon has already claimed the best square |
| Second | A hard encounter answer | Control, defense, movement, or a different defense to target when the obvious plan stalls |
| Third | A party gap-filler | Something your group otherwise cannot do reliably |
| Fourth | A campaign tool | Travel, investigation, language, concealment, or another recurring problem from the campaign |
When you level up, you can replace one same-rank repertoire spell, but not a link spell. Ordinary repertoire choices remain adjustable; review link-spell choices carefully before they become muscle memory.
The cantrip guide, heightening guide, and utility spell guide are the right next stops when you need to fill one of those jobs rather than chase a famous spell name.
Let the Eidolon Choose the Tradition Question
The eidolon determines the Summoner's spell tradition. Do not choose a tradition in isolation: choose the eidolon's battlefield role, the party's existing coverage, and the sort of problems the campaign actually presents.
| Tradition | Start here when you want... | Read next |
|---|---|---|
| Arcane | Broad problem-solving, control, and magical utility | Arcane spells |
| Divine | Protection, recovery, and answers to spiritual threats | Divine spells |
| Occult | Mind-facing tools, information, and unusual control | Occult spells |
| Primal | Nature, elemental pressure, and adaptable exploration magic | Primal spells |
An eidolon can excel at a job that its tradition does not reinforce. That is often a feature. A durable front-liner paired with a repertoire that solves movement and control problems gives the partnership more angles than two copies of the same answer.
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Link Spells Are a Separate Resource Plan
Link spells belong to the partnership, not to the ordinary repertoire. You begin with one Focus Point, regain it through daily preparation and Refocus, and can eventually hold up to three. The important rule is simple: Boost Eidolon and Reinforce Eidolon cannot both benefit the eidolon at once. Using one replaces the other.
| Link spell or option | Use it when... | What to watch |
|---|---|---|
| Boost Eidolon | The eidolon is about to make the attack or action you built the turn around | Do not keep it active out of habit if defense is now the real problem |
| Reinforce Eidolon | The eidolon must hold a dangerous square or survive a punishing exchange | It replaces Boost Eidolon, so the turn has a real offense-versus-survival choice |
| Evolution Surge | Movement, senses, body shape, reach, or terrain suddenly matter | It is a tactical adaptation tool, not a reason to ignore the map until trouble starts |
| Extend Boost | A skill result can keep a useful boost going | Plan the skill use before the effect would expire |
| Lifelink Surge | The partnership needs immediate resilience more than another flashy effect | Spending Focus to stay functional can preserve the whole shared turn |
| Unfetter Eidolon | A link option gives the eidolon the freedom it needs in a constrained moment | Read the feat and spell together before treating it as a default button |
| Eidolon's Wrath | The eidolon is positioned to turn a local threat into an area problem | It comes from a feat and competes with other Focus uses |
Evolution Surge is especially valuable because it changes what the pair can attempt: an environmental obstacle, a pursuit, a reach problem, or a place the eidolon needs to be before the encounter is decided. Keep it in the "solve the scene" category, not the "cast every fight" category.
Pace Focus Points for the Eidolon You Actually Have
Focus Points are not a bonus pool that appears after the real spellcasting decisions. They are part of the real spell plan. A Summoner who expects the eidolon to absorb pressure needs to leave room for defensive links. A Summoner who expects to win through a specific opening needs to know whether Boost Eidolon is the opening or merely the comfortable default.
Use a short pre-fight check:
- Is the eidolon likely to take the dangerous position?
- Does the map demand an adaptation before ordinary spells can matter?
- Is the encounter important enough to spend a Focus Point before you know the enemy's full plan?
- Can the party Refocus safely after this scene?
The focus spell guide gives the broader system rules. The Summoner version is narrower: every Focus spell should support the shared body, shared actions, and the one encounter role your eidolon is taking right now.
Hot Take: A Summoner who spends every Focus Point on spectacle while the eidolon absorbs the front line is paying for a second wave spell with the entire turn. Reinforce Eidolon and Lifelink Surge are often the better cast when keeping the partnership standing preserves the next round.
Eidolon Spellcasting Is Not a Second Repertoire
An eidolon normally cannot Cast a Spell. Feats such as Magical Understudy, Magical Adept, and Magical Master can give it spells of its own. Those spells use the Summoner's spell DC and spell attack modifier. The eidolon has no separate Focus Point pool, cannot Refocus, and cannot cast the Summoner's spells; the Summoner cannot cast the eidolon's spells either.
That restriction is useful design guidance. Give eidolon magic a clearly eidolon-shaped task: an effect that matters from the eidolon's position, an action that rewards having the right body in the right square, or a capability that lets the Summoner use the rest of the turn differently. Magical Share and Eidolon's Wrath make the same point from different directions: the pair can cooperate magically, but they do not become two independent full casters.
For the feat sequence, including Magical Understudy, Magical Adept, Magical Master, Magical Share, Magical Onslaught, Master Summoner, Boost Summons, and Legendary Summoner, use the Summoner feat guide. It explains which choices change the spell plan and which are better treated as a later specialization.
Build Ordinary Spell Turns Around a Job
The Summoner and eidolon share a turn. That means a powerful spell with no place in the action plan is less valuable than it looks in a vacuum. Before adding a spell to the repertoire, finish this sentence: "I cast this when the eidolon is doing _______."
| If the eidolon is... | Look for spells that... | Useful guide |
|---|---|---|
| Holding a line | Protect it, control the approach, or give the party a different target to pressure | Combat spells |
| Chasing or reaching | Change movement, terrain, senses, or the party's route | Utility spells |
| Beside a vulnerable ally | Break up a bad enemy plan or make escape possible | Focus spells |
| Away from the immediate threat | Create information, control, or a nonphysical answer the eidolon cannot provide | Your tradition guide above |
This is why a Summoner can feel much stronger after removing one redundant spell. The eidolon already supplies a continuing physical presence. The repertoire should make that presence matter in situations where another strike would not change enough.
Feats That Change the Spell Plan
Not every Summoner feat is a spell feat, but several decisions change which magic the character can afford to prepare around.
| Feat or option | Spell-plan effect |
|---|---|
| Magical Understudy, Adept, and Master | Establish and expand the eidolon's own limited casting |
| Magical Share | Makes the partnership's magic more cooperative without erasing the separate-spell restriction |
| Eidolon's Wrath | Adds a Focus-spell reason to care about the eidolon's location |
| Master Summoner and Boost Summons | Reward a build that treats summoned creatures as a real part of its plan |
| Link Focus | Helps a link-spell-focused build maintain its Focus Point economy |
| Effortless Concentration and Eternal Boost | Support a later build that cares about sustained or repeated magical pressure |
The question is not "which magic feat is strongest?" It is "which one gives this partnership an action or resource decision it already wants to make?" If your answer is unclear, buy the feat after the ordinary repertoire and link-spell plan are doing useful work.
Four Summoner Spell Packages
These are planning packages, not fixed spell lists. Pick the package that matches the eidolon and then fill it from the appropriate tradition guide.
The guardian link
Use this when the eidolon is expected to hold space. Prioritize a reliable cantrip, one response to clustered or advancing enemies, one defensive or escape answer, and a Focus plan that leaves room for Reinforce Eidolon or Lifelink Surge. Do not spend every slot on more damage the eidolon already delivers.
The mobile adaptation kit
Use this when terrain, pursuits, exploration, and changing distance decide many sessions. Evolution Surge is the center of the plan. Let repertoire spells handle the follow-up: getting allies through the new route, controlling the enemy's route, or solving the scene after the eidolon has reached the right place.
The innate-magic partner
Use this only after deciding what the eidolon needs to cast that the Summoner cannot cover as cleanly. Magical Understudy and its upgrades are not an excuse to duplicate the repertoire. They are a way to give the eidolon a distinct magical contribution from its own position.
The summoned-support build
Use this when Master Summoner and Boost Summons are part of the character's identity. Reserve ordinary spells for the problems the summoned creature and eidolon cannot cover at the same time. This package has more moving parts, so it benefits from a small, repeatable plan rather than a bag full of one-scene tricks.
Common Summoner Spell Traps
- Treating the eidolon as a second character with an independent spell list. It is not; its magic is feat-granted and bounded by the shared partnership rules.
- Filling the repertoire with effects the eidolon already provides through position and reliable physical pressure.
- Casting Boost Eidolon by default when Reinforce Eidolon would keep the important square from collapsing.
- Saving every Focus Point for a perfect encounter, then ending the adventuring day with the eidolon having done all the hard work without the support it needed.
- Choosing eidolon magic before deciding whether the eidolon's location actually makes that spell more valuable.
- Reading a tradition's strongest spell in isolation instead of asking what it costs the shared turn.
Related Summoner Guides
- Summoner Class Guide: shared actions, eidolon choice, link basics, and the class's table role.
- Summoner Feat Guide: feat paths for casting, links, summons, and eidolon specialization.
- PF2e Spell Guides: every live tradition, cantrip, focus, combat, and utility guide.
- Staves and Wands in PF2e: equipment options that can cover a narrow magical job without permanently narrowing the repertoire.
