Your eidolon’s level is equal to yours. They begin with expert proficiency in Fortitude and Will saves and trained proficiency in Reflex saves and Perception. In addition, they’re trained in unarmed attacks and unarmored defense. They share your skill proficiencies. Certain class features increase your eidolon’s proficiencies.

Many of an eidolon's attribute modifiers are set, but when you choose your eidolon, you decide their key attribute. Choose Strength or Dexterity as your eidolon's key attribute. They gain a +4 attribute modifier for that attribute, and a +2 attribute modifier for the one you didn't choose. Your eidolon's other attribute modifiers are listed in their entry under Eidolon Attributes.

This also sets your eidolon's defenses, as represented by an item bonus to AC and their Dexterity cap. If Strength is their key attribute, your eidolon has a +2 item bonus to AC with a +3 Dexterity cap. If Dexterity is their key attribute, your eidolon has +1 item bonus to AC with a +4 Dexterity cap. The appearance of the eidolon's protection can be anything you choose that fits the eidolon: armor, scales, tough hide, a mystical aura of deflection, and so on.

As noted in your attribute boosts class feature, your eidolon gets boosts to their attribute modifiers starting at 5th level at the same time you do. They also increase one modifier by 1 when they gain their transcendence ability.

Your eidolon starts with two unarmed attacks. Each eidolon entry suggests some forms the eidolon's attacks might take, but since eidolons can have a variety of body shapes, you decide the specific form of the unarmed attacks (claw, jaws, horn, fist, and so on) when you choose your eidolon. Some eidolons' unarmed attacks might look like swords, clubs, or other weapons, even though they are extensions of the eidolon's form. Your choice of unarmed attack determines its damage type— bludgeoning, piercing, or slashing, as appropriate. Some of the suggested attacks list a typical damage type in parentheses, but you can work with your GM to choose a damage type that is right for your eidolon. Once you decide upon your eidolon's unarmed attacks, they can't be changed except via abilities that specifically change them, except with your GM's permission. Your eidolon has a primary and secondary unarmed attack.

Primary Attack: Choose from the following statistics for the more flexible primary attack.

• 1d8 damage (choose one of disarm, nonlethal, shove, or trip)
• 1d6 damage (fatal d10)
• 1d6 damage (forceful and sweep)
• 1d6 damage (deadly d8 and finesse)

Secondary Attack: The secondary attack always deals 1d6 damage and has the agile and finesse traits.

An eidolon normally can't Cast a Spell; however, some feats or abilities can grant them this capability. An eidolon that has spells also gains the Cast a Spell activity. They don't have their own spell DC or spell attack modifier; if they need to Cast a Spell, they use your spell DC and spell attack modifier. If your eidolon has focus spells, those spells count toward your focus pool maximum and your eidolon uses your Focus Points to cast them. Your eidolon can't Refocus. Your eidolon can cast only spells they gain from their own abilities. They can't cast your spells, nor can you cast spells they have.

An eidolon entry contains the following information, followed by a description of the eidolon's initial ability and abilities gained from the eidolon symbiosis and eidolon transcendence class features.

Tradition This is the eidolon's corresponding magical tradition, which determines the type of magic you can cast.
Traits All eidolons have the eidolon trait, and each type of eidolon has additional traits. They all appear in this entry. Home Plane This is the eidolon's home plane, where they go when unmanifested. This can help you determine the effects of abilities dependent on a creature's home plane, such as banishment.

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Size This is the eidolon's starting Size.
Suggested Attacks This entry suggests forms that the eidolon's attacks might take (see Unarmed Attacks above).
Eidolon Attributes Your eidolon's attributes other than Strength and Dexterity start at the values listed here (see Attribute Modifiers and Defenses).
Skills These are the skills that the eidolon has taught you, or that you learned as part of linking with your eidolon. You are trained in these skills, and the eidolon shares this proficiency as normal for their skills.
Senses This entry, if present, lists your eidolon's special senses. If this entry is not present, the eidolon has senses like a human's.
Language This is the eidolon's starting language. You know this language, in addition to the other languages you know normally. Your eidolon doesn't gain any additional languages based on their Intelligence modifier, but they can speak all the same languages you can.
Speed This entry lists your eidolon's Speeds.

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Eidolon Abilities The eidolon starts with an initial ability, gains the symbiosis ability when you gain the eidolon symbiosis class feature, and gains the transcendence ability when you gain the eidolon transcendence class feature.