Evolutions
The following new evolutions can be taken by any eidolon that meets the prerequisites.
1-Point Evolutions
The following evolutions cost 1 point from the eidolon's evolution pool.
An eidolon learns to cast a basic spell as a spell-like ability. Select one spell from the following list: acid splash, dancing lights, daze, detect magic, flare, ghost sound, light, mage hand, ray of frost, stabilize, or touch of fatigue. This spell can be cast once per day as a spell-like ability. At 4th level, this spell can be cast three times per day by spending 2 additional evolution points. The caster level for this evolution is equal to the eidolon's Hit Dice. The save DC for this spell is 10 + the eidolon's Charisma modifier. The eidolon must have a Charisma score of at least 10 to take this evolution. This evolution can be selected more than once. Each time an eidolon selects this evolution, it applies to a new spell.
An eidolon has a pair of sharp hooves at the end of its limbs, giving it two hoof attacks. These attacks are secondary attacks. The hooves deal 1d4 points of damage (1d6 if Large, 1d8 if Huge). The eidolon must have the limbs evolution to take this evolution. This evolution can only be applied to the limbs (legs) evolution once. Alternatively, the eidolon can replace the claws evolution from its base form with these hoof attacks (this still costs 1 evolution point). This evolution can be selected more than once, but the eidolon must possess an equal number of limbs evolutions.
An eidolon gains low-light vision, enabling it to see twice as far as a human in conditions of dim light.
An eidolon is obviously of unnatural origin. Normal animals do not willingly approach the eidolon unless the animal's master makes a DC 25 Handle Animal, Ride, or wild empathy check.
2-Point Evolutions
The following evolutions each cost 2 points from the eidolon's evolution pool.
An eidolon becomes less easily affected by the channel energy ability of clerics or paladins. The eidolon gains a +2 bonus on any saves that are made to resist the effects of channel energy, including effects that rely on the use of channel energy (such as the Command Undead feat). At 7th level, this bonus can be increased to +4 by spending 2 additional evolution points. The eidolon must possess the undead appearance evolution to take this evolution.
Head
An eidolon grows an additional head. The eidolon does not gain any additional natural attacks for the additional head, but the additional head does allow the eidolon to take other evolutions that add an additional attack to a head (such as a bite, gore, or breath weapon). This evolution can be selected more than once.
Keen Scent
An eidolon's sense of smell becomes even more acute. The eidolon can notice other creatures by scent in a 180-foot radius underwater and can detect blood in the water at ranges of up to a mile. The eidolon must possess the gills and scent evolutions to take this evolution.
An eidolon learns to cast a minor spell as a spell-like ability. Select one spell from the following list: burning hands, comprehend languages, cure light wounds, detect chaos/evil/good/law, magic missile, obscuring mist, silent image, vanish (self only), or ventriloquism. This spell can be cast once per day as a spell-like ability. At 7th level, this spell can be cast three times per day by spending 2 additional evolution points. The caster level for this evolution is equal to the eidolon's Hit Dice – 2. The save DC for this spell is 10 + 1/2 the eidolon's HD + the eidolon's Charisma modifier. The eidolon must have a Charisma score of at least 11 and must possess the basic magic evolution to take this evolution.
The summoner must be at least 4th level before selecting this evolution. This evolution can be selected more than once. Each time an eidolon selects this evolution, it applies to a new spell from the above list.
An eidolon appears as an undead creature, and mimics some of an undead creature's abilities and weaknesses. Negative energy heals the eidolon, and positive energy (including a cleric's channel energy ability) harms it. Spells and effects that target undead or have specific effects against undead (such as Command Undead, hold undead, and searing light) affect the eidolon as if it were undead. The eidolon gains a +2 bonus on saves against disease, exhaustion, fatigue, paralysis, poison, sleep effects, and stunning.
At 7th level, this bonus on saves can be increased to +4 by spending 2 additional evolution points. At 12th level, this protection can be increased to immunity against these attacks by spending 2 additional evolution points (the summoner must pay for the 7th-level upgrade before paying for this 12th-level upgrade).
Although the eidolon appears undead, it is still an outsider.
3-Point Evolutions
The following evolutions cost 3 points from the eidolon's evolution pool.
An eidolon learns to cast a major spell as a spell-like ability. Select one spell from the following list: acid arrow, cure moderate wounds, darkness, daze monster, glide, invisibility (self only), lesser restoration, levitate, minor image, scorching ray, see invisibility, or spider climb. This spell can be cast once per day as a spell-like ability.
At 10th level, this spell can be cast three times per day by spending 2 additional evolution points. The caster level for this evolution is equal to the eidolon's Hit Dice – 2. The save DC for this spell is 10 + 1/2 the eidolon's HD + the eidolon's Charisma modifier. The eidolon must have a Charisma score of at least 12 and must possess the minor magic evolution to take this evolution. The summoner must be at least 7th level before selecting this evolution. This evolution can be selected more than once. Each time an eidolon selects this evolution, it applies to a new spell from the above list.
See in Darkness
An eidolon can see perfectly in darkness of any kind, including that created by deeper darkness. The summoner must be at least 9th level before selecting this evolution.
4-Point Evolutions
The following evolutions cost 4 points from the eidolon's evolution pool.
An eidolon learns to cast dimension door as a spell-like ability once per day. The caster level for this evolution is equal to the eidolon's Hit Dice. The save DC for this spell is 10 + 1/2 the eidolon's HD + the eidolon's Charisma modifier. The eidolon must have a Charisma score of at least 14 to take this evolution. The summoner must be at least 13th level before selecting this evolution.
Once per day, an eidolon can become incorporeal for 1 round per summoner level. While in this form, the eidolon gains the incorporeal subtype and incorporeal quality. It only takes half damage from corporeal sources as long as they are magic (it takes no damage from nonmagical weapons and objects). Likewise, its spells or spell-like abilities deal only half damage to corporeal creatures. Spells and other effects that do not deal damage function normally. The summoner must be at least 15th level before selecting this evolution.
An eidolon can pinpoint living creatures with ease. The eidolon notices and locates living creatures within 60 feet, just as if it possessed the blindsight evolution. The eidolon must possess the undead appearance evolution to take this evolution. The summoner must be at least 11th level before selecting this evolution.
No Breath
An eidolon no longer needs to breathe. The eidolon does not breathe, and is immune to effects that require breathing (such as inhaled poison). This does not give immunity to cloud or gas attacks that do not require breathing. The summoner must be at least 11th level before selecting this evolution.
An eidolon learns to cast a powerful spell as a spell-like ability. Select one spell from the following list: arcane sight, create food and water, cure serious wounds, daylight, fireball, fly, gaseous form, lightning bolt, major image, stinking cloud, tongues, or water breathing. This spell can be cast once per day as a spell-like ability. The caster level for this evolution is equal to the eidolon's Hit Dice – 2. The save DC for this spell is 10 + 1/2 the eidolon's HD + the eidolon's Charisma modifier. The eidolon must have a Charisma score of at least 13 and must possess the major magic evolution to take this evolution.
The summoner must be at least 11th level before selecting this evolution. This evolution can be selected more than once. Each time an eidolon selects this evolution, it applies to a new spell from the above list.