Evolutions
Each eidolon receives a number of evolution points that can be spent to give the eidolon new abilities, powers, and other upgrades. These abilities, called evolutions, can be changed whenever the summoner gains a new level, but they are otherwise set. Some evolutions require that the eidolon have a specific base form or the summoner be of a specific level before they can be chosen. A number of evolutions grant the eidolon additional natural attacks. Natural attacks listed as primary are made using the eidolon's full base attack bonus and add the eidolon's Strength modifier on damage rolls. Natural attacks listed as secondary are made using the eidolon's base attack bonus – 5 and add 1/2 the eidolon's Strength modifier on damage rolls (if positive). If the eidolon only has a single natural attack, the attack is made using its full base attack bonus and it adds 1-1/2 times its Strength modifier on damage rolls made with that attack, regardless of the attack's type.
Evolutions are grouped by their cost in evolution points. Evolution points cannot be saved. All of the points must be spent whenever the summoner gains a level. Unless otherwise noted, each evolution can only be selected once.
1-Point Evolutions
The following evolutions cost 1 point from the eidolon's evolution pool.
Bite
An eidolon's maw is full of razor-sharp teeth, giving it a bite attack. This attack is a primary attack. The bite deals 1d6 points of damage (1d8 if Large, 2d6 if Huge). If the eidolon already has a bite attack, this evolution allows it to deal 1-1/2 times its Strength modifier on damage rolls made with its bite.
An eidolon has a pair of vicious claws at the end of its limbs, giving it two claw attacks. These attacks are primary attacks. The claws 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 This evolution can be selected more than once, but the eidolon must possess an equal number of the limbs evolution.
An eidolon becomes a skilled climber, gaining a climb speed equal to its base speed. This evolution can be selected more than once. Each additional time it is selected, increase the eidolon's climb speed by 20 feet.
An eidolon has gills and can breathe underwater indefinitely.
One of the eidolon's natural attacks is particularly deadly. Select one natural attack form and increase the damage die type by one step. This evolution can be selected more than once. Its effects do not stack. Each time an eidolon selects this evolution, it applies to a different natural attack.
An eidolon's hide grows thick fur, rigid scales, or bony plates, giving it a +2 bonus to its natural armor. This evolution can be taken once for every five levels the summoner possesses.
An eidolon is infused with magic, allowing it to treat all of its natural attacks as if they were magic for the purpose of overcoming damage reduction. If the summoner is 10th level or higher, all of the eidolon's weapons are treated as the alignment of the eidolon for the purpose of overcoming damage reduction.
An eidolon is properly skilled and formed to serve as a combat-trained mount. The eidolon must be at least one size category larger than its rider. This evolution is only available to eidolons of the quadruped and serpentine base forms.
An eidolon grows a large pincers at the end of one pair of its limbs, giving it two pincer attacks. These attacks are secondary attacks. The pincers deal 1d6 points of damage (1d8 if Large, 2d6 if Huge). Eidolons with the grab evolution linked to pincers gain a +2 bonus on CMB checks made to grapple. The eidolon must have the limbs (arms) evolution to take this evolution. Alternatively, the eidolon can replace the claws from its base form with pincers (this still costs 1 evolution point). This evolution can be selected more than once, but the eidolon must possess an equal number of the limbs evolution.
An eidolon gains quick reflexes, allowing it to make a full attack after a charge. This evolution is only available to eidolons of the quadruped base form.
Pull
An eidolon gains the ability to pull creatures closer with a successful attack. Select one type of natural attack. Whenever the eidolon makes a successful attack of the selected type, it can attempt a free combat maneuver check. If successful, the target of the attack is pulled 5 feet closer to the eidolon. This ability only works on creatures of a size equal to or smaller than the eidolon. Creatures pulled in this way do not provoke attacks of opportunity. The eidolon must have a reach of 10 feet or more to select this evolution. This evolution can be selected more than once. Its effects do not stack. Each time an eidolon selects this evolution, it applies to a different natural attack.
Push
An eidolon gains the ability to push creatures away with a successful attack. Select one type of natural attack. Whenever the eidolon makes a successful attack of the selected type, it can attempt a free combat maneuver check. If successful, the target of the attack is pushed 5 feet directly away from the eidolon. This ability only works on creatures of a size equal to or smaller than the eidolon. Creatures pushed in this way do not provoke attacks of opportunity. This evolution can be selected more than once. Its effects do not stack. Each time an eidolon selects this evolution, it applies to a different natural attack.
One of an eidolon's attacks is capable of striking at foes at a distance. Pick one attack. The eidolon's reach with that attack increases by 5 feet.
An eidolon's form takes on a resiliency to one particular energy type, which is usually reflected in its physical body (ashen hide for fire, icy breath for cold, and so on). Pick one energy type (acid, cold, electricity, fire, or sonic). The eidolon gains resist 5 against that energy type. This resistance increases by 5 for every 5 levels the summoner possesses, to a maximum of 15 at 10th level. This evolution can be selected more than once. Its effects do not stack. Each time an eidolon selects this evolution, it applies to a different energy type.
An eidolon's sense of smell becomes quite acute. The eidolon gains the scent special quality, allowing it to detect opponents within 30 feet by sense of smell. If the opponent is upwind, the range increases to 60 feet; if downwind, it drops to 15 feet. Strong scents can be detected at twice the normal range. Scent does not allow the eidolon to precisely locate the creature, only to detect its presence. It can detect the direction with a move action. The eidolon can pinpoint the creature's location if it is within 5 feet. The eidolon can use scent to track creatures.
An eidolon becomes especially adept at a specific skill, gaining a +8 racial bonus on that skill. This evolution can be selected more than once. Its effects do not stack. Each time an eidolon selects this evolution, it applies to a different skill.
Slam
An eidolon can deliver a devastating slam attack. This attack is a primary attack. The slam deals 1d8 points of damage (2d6 if Large, 2d8 if Huge). The eidolon must have the limbs (arms) evolution to take this evolution. Alternatively, the eidolon can replace the claws from its base form with this slam attack (this still costs 1 evolution point). This evolution can be selected more than once, but the eidolon must possess an equal number of the limbs evolution.
An eidolon possesses a long, barbed stinger at the end of its tail, granting it a sting attack. This attack is a primary attack. The sting deals 1d4 points of damage (1d6 if Large, 1d8 if Huge). The eidolon must possess the tail evolution to take this evolution. This evolution can be selected more than once, but the eidolon must possess an equal number of the tail evolution.
Swim
An eidolon gains webbed hands, feet, or powerful flippers, giving it a swim speed equal to its base speed. This evolution does not give the eidolon the ability to breathe underwater. This evolution can be selected more than once. Each additional time it is selected, increase the eidolon's swim speed by 20 feet.
Tail
An eidolon grows a long, powerful tail. This grants it a +2 racial bonus on Acrobatics checks made to balance on a surface. This evolution can be selected more than once.
Tail Slap
An eidolon can use its tail to bash nearby foes, granting it a tail slap attack. This attack is a secondary attack. The tail slap deals 1d6 points of damage (1d8 if Large, 2d6 if Huge). The eidolon must possess the tail evolution to take this evolution. This evolution can be selected more than once, but the eidolon must possess an equal number of the tail evolution.
An eidolon possesses a long, sinuous tentacle, granting it a tentacle attack. This attack is a secondary attack. The tentacle attack deals 1d4 points of damage (1d6 if Large, 1d8 if Huge). This evolution can be selected more than once.
Wing Buffet
An eidolon learns to use its wings to batter foes, granting it two wing buffet attacks. These attacks are secondary attacks. The wing buffets deal 1d4 points of damage (1d6 if Large, 1d8 if Huge). The eidolon must possess the flight evolution, with wings, to select this evolution.
2-Point Evolutions
The following evolutions cost 2 points from the eidolon's evolution pool.
An eidolon grows larger muscles, gains faster reflexes, achieves greater intelligence, or acquires another increase to one of its abilities. Increase one of the eidolon's ability scores by +2. This evolution can be selected more than once. It can only be applied once to an individual ability score, plus 1 additional time for every 6 levels the summoner possesses.
An eidolon gains powerful muscles that allow it to crush those it grapples. Whenever the eidolon successfully grapples a foe using the grab evolution, it deals additional damage equal to the amount of damage dealt by the attack used by the grab evolution. This evolution is only available to eidolons of the serpentine base form.
An eidolon's attacks become charged with energy. Pick one energy type: acid, cold, electricity, or fire. All of the eidolon's natural attacks deal 1d6 points of energy damage of the chosen type on a successful hit. The summoner must be at least 5th level before selecting this evolution.
An eidolon grows large wings, like those of a bat, bird, insect, or dragon, gaining the ability to fly. The eidolon gains a fly speed equal to its base speed. The eidolon's maneuverability depends on it size. Medium or smaller eidolons have good maneuverability. Large eidolons have average maneuverability, while Huge eidolons have poor maneuverability. For 2 additional evolution points, the eidolon flies by means of magic. It loses its wings, but its maneuverability increases to perfect. Flying via magic means makes this a supernatural ability. The eidolon's fly speed can be increased by spending additional evolution points, gaining a 20-foot increase to fly speed for each additional point spent. The summoner must be at least 5th level before selecting this evolution.
Gore
An eidolon grows a number of horns on its head, giving it a gore attack. This attack is a primary attack. The gore deals 1d6 points of damage (1d8 if Large, 2d6 if Huge).
Grab
An eidolon becomes adept at grappling foes, gaining the grab ability. Pick bite, claw, pincers, slam, tail slap, or tentacle attacks. Whenever the eidolon makes a successful attack of the selected type, it can attempt a free combat maneuver check. If successful, the eidolon grapples the target. This ability only works on creatures of a size one category smaller than the eidolon or smaller. Eidolons with this evolution receive a +4 bonus on CMB checks made to grapple.
An eidolon's body becomes extremely resilient to one energy type, gaining immunity to that type. Pick one energy type: acid, cold, electricity, fire, or sonic. The eidolon gains immunity to that energy type. This evolution can be selected more than once. Its effects do not stack. Each time it applies to a different energy type. The summoner must be at least 7th level before selecting this evolution.
An eidolon grows an additional pair of limbs. These limbs can take one of two forms. They can be made into legs, complete with feet. Each pair of legs increases the eidolon's base speed by 10 feet. Alternatively, they can be made into arms, complete with hands. The eidolon does not gain any additional natural attacks for an additional pair of arms, but it can take other evolutions that add additional attacks (such as claws or a slam). Arms that have hands can be used to wield weapons, if the eidolon is proficient. This evolution can be selected more than once.
An eidolon secretes toxic venom, gaining a poison attack. Pick one bite or sting attack. Whenever the selected attack hits, the target is poisoned. Eidolon poison—type poison (injury); save Fort negates; frequency 1/round for 4 rounds; effect 1d4 Str damage; cure 1 save. The save DC is equal to 10 + 1/2 the eidolon's HD + the eidolon's Constitution modifier. For 2 additional evolution points, this poison deals Constitution damage instead. This poison can be used no more than once per round. The summoner must be at least 7th level before selecting this evolution.
Rake
An eidolon grows dangerous claws on its feet, allowing it to make 2 rake attacks on foes it is grappling. These attacks are primary attacks. The eidolon receives these additional attacks each time it succeeds on a grapple check against the target. These rake attacks deal 1d4 points of damage (1d6 if Large, 1d8 if Huge). This evolution is only available to eidolons of the quadruped base form. This evolution counts as one natural attack toward te eidolon's maximum. The summoner must be at least 4th level before selecting this evolution.
Rend
An eidolon learns to rip and tear the flesh of those it attacks with its claws, gaining the rend ability. Whenever the eidolon makes two successful claw attacks against the same target in 1 round, its claws latch onto the flesh and deal extra damage. This damage is equal to the damage dealt by one claw attack plus 1-1/2 times the eidolon's Strength modifier. The eidolon must possess the claws evolution to select this evolution. The summoner must be at least 6th level before selecting this evolution.
An eidolon gains the ability to crush its foes underfoot, gaining the trample ability. As a full-round action, the eidolon can overrun any creature that is at least one size smaller than itself. This works like the overrun combat maneuver, but the eidolon does not need to make a check, it merely has to move over opponents in its path. The creatures take 1d6 points of damage (1d8 if Large, 2d6 if Huge), plus 1-1/2 times the eidolon's Strength modifier. Targets of the trample can make attacks of opportunity at a –4 penalty. If a target forgoes the attack of opportunity, it can make a Reflex save for half damage. The DC of this save is 10 + 1/2 the eidolon's HD + the eidolon's Strength modifier. A trampling eidolon can only deal trampling damage to a creature once per round. This evolution is only available to eidolons of the biped or quadruped base forms.
An eidolon becomes attuned to vibrations in the ground, gaining tremorsense out to a range of 30 feet. This works like the blindsense evolution, but only if both the eidolon and the creature to be pinpointed are in contact with the ground. The summoner must be at least 7th level before selecting this evolution.
Trip
An eidolon becomes adept at knocking foes to the ground with its bite, granting it a trip attack. Whenever the eidolon makes a successful bite attack of the selected type, it can attempt a free combat maneuver check. If successful, the target is knocked prone. If the check fails, the eidolon is not tripped in return. This ability only works on creatures of a size equal to or smaller than the eidolon. The eidolon must possess the bite evolution to select this evolution.
An eidolon learns to use a weapon, gaining Simple Weapon Proficiency as a bonus feat. If 2 additional evolution points are spent, it gains proficiency with all martial weapons as well.
3-Point Evolutions
The following evolutions cost 3 points from the eidolon's evolution pool.
An eidolon's senses become incredibly acute, giving it blindsense out to a range of 30 feet. This ability allows the eidolon to pinpoint the location of creatures that it cannot see without having to make a Perception check, but such creatures still have total concealment from the eidolon. Visibility still affects the eidolon's movement and it is still denied its Dexterity bonus to Armor Class against attacks from creatures it cannot see. The summoner must be at least 9th level before selecting this evolution.
An eidolon grows thick and gnarled claws, allowing it to move through the earth. The eidolon gains a burrow speed equal to 1/2 its base speed. It can use this speed to move through dirt, clay, sand, and earth. It does not leave a hole behind, nor is its passage marked on the surface. The summoner must be at least 9th level before selecting this evolution.
An eidolon's body becomes resistant to harm, granting it damage reduction. Choose one alignment: chaotic, evil, good, or lawful. The eidolon gains DR 5 that can be bypassed by weapons that possess the chosen alignment. The alignment must be opposite to one of the alignments possessed by the eidolon. At 12th level, this protection can be increased to DR 10 by spending 2 additional evolution points. The summoner must be at least 9th level before selecting this evolution.
An eidolon becomes unsettling to its foes, gaining the frightful presence ability. The eidolon can activate this ability as part of an offensive action, such as a charge or attack. Opponents within 30 feet of the eidolon must make a Will save or become shaken for 3d6 rounds. The DC of this save is equal to 10 + 1/2 the eidolon's HD + the eidolon's Charisma modifier. If the eidolon has at least 4 more Hit Dice than an opponent, that opponent becomes frightened instead. Foes with more HD than the eidolon are immune to this effect. The summoner must be at least 11th level before selecting this evolution.
An eidolon gains the swallow whole ability, giving it the ability to consume its foes. If the eidolon begins its turn with a creature grappled using its bite attack (see the grab evolution), it can attempt a combat maneuver check to swallow the creature. The creature can be up to one size category smaller than the eidolon. Swallowed creatures take damage equal to the eidolon's bite damage each round plus 1d6 points of bludgeoning damage. A swallowed creature keeps the grappled condition, but can attempt to cut its way free with a light slashing or piercing weapon. The amount of damage needed to cut free is equal to 1/10 the eidolon's total hit points. The eidolon's AC against these attacks is equal to 10 + 1/2 its natural armor bonus. If a swallowed creature cuts its way out, the eidolon loses this ability until it heals this damage. Alternatively, the swallowed creature can attempt to escape the grapple as normal. Success indicates that it has returned to the eidolon's mouth, where it can attempt to escape or be swallowed again. The eidolon must possess the grab evolution, tied to a bite attack, to take this evolution. The summoner must be at least 9th level before selecting this evolution.
Web
An eidolon gains a pair of spinnerets, giving it the ability to spin webs. The eidolon can use these webs to support itself plus up to one creature of the same size. It can throw webbing as a ranged touch attack up to 8 times per day, entangling a creature up to one size larger than the eidolon. The webbing has a range of 50 feet and a 10-foot range increment. Creatures entangled by the web can escape with an Escape Artist check or a Strength check (at a –4 penalty). The DC of these checks is equal to 10 + 1/2 the eidolon's HD + the eidolon's Con modifier. The webs have a Hardness of 0 and a number of hits points equal to the eidolon's total Hit Dice. The eidolon can climb its own webs at its climb speed and can pinpoint any creature touching its webs. The eidolon must possess the climb evolution to take this evolution. The summoner must be at least 7th level before selecting this evolution.
4-Point Evolutions
The following evolutions cost 4 points from the eidolon's evolution pool.
An eidolon's senses sharpen even further, granting it blindsight out to a range of 30 feet. The eidolon can maneuver and attack as normal, ignoring darkness, invisibility, and most forms of concealment as long as it has line of effect to the target. The eidolon must possess the blindsense evolution to take this evolution. The summoner must be at least 11th level before selecting this evolution.
An eidolon learns to exhale a cone or line of magical energy, gaining a breath weapon. Select either acid, cold, electricity, or fire. The eidolon can breathe a 30-foot cone (or 60-foot line) that deals 1d6 points of damage of the selected type per HD it possesses. Those caught in the breath weapon can attempt a Reflex save for half damage. The DC is equal to 10 + 1/2 the eidolon's HD + the eidolon's Constitution modifier. The eidolon can use this ability once per day. The eidolon can use this ability 1 additional time per day by spending an additional 1 evolution point (maximum 3/day). The summoner must be at least 9th level before selecting this evolution.