Archives of Nethys

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Eidolon (Unchained) Details | Base Forms | Evolutions | Subtypes

Eidolon (Unchained) Subtypes

Description Source: Pathfinder Unchained
The first time a summoner calls his eidolon, he must decide on its subtype. The eidolon’s subtype determines a number of its base statistics and abilities, as well as its overall look and theme. The subtype also determines what sort of evolutions the summoner can select for his eidolon using the evolution pool. Once the choice of subtype is made, it cannot be changed.

As a summoner gains levels, his eidolon gains specific evolutions based on its subtype. Each subtype entry below includes the following information.

Name: This is the name of the eidolon’s subtype. The eidolon gains this as a subtype, but unless otherwise noted, it does not gain any of the features, abilities, or weaknesses of that subtype.

Description: This gives a basic overview of eidolons of this subtype, including general guidelines on appearance and personality.

Alignment: The eidolon is a creature of this alignment. If its alignment is chaotic, evil, lawful, or good, it gains that subtype.

Base Form: Eidolons of some subtypes are restricted in their choice of base form. Restrictions are spelled out here. The evolutions listed here are gained automatically, and do not cost points from the eidolon’s evolution pool. (See page 34.)

Base Evolutions: This describes the base evolutions possessed by all eidolons of this subtype. Following the entry is a list of evolutions gained as the summoner gains levels; these evolutions are gained automatically, and do not cost points from the eidolon’s evolution pool. In some cases, eidolons of certain subtypes will gain abilities that are not evolutions. Unless otherwise noted, such abilities function as described in the Universal Monster Rules section beginning on page 297 of the Pathfinder RPG Bestiary. (See page 34.)

Eidolons and Alignment

Generally, the summoner controls the actions of his eidolon, even during combat, either through verbal commands or through the link ability, but this does not mean that the eidolon is a puppet that follows every command without question. Eidolons have been known to refuse actions that are against their ethoses or alignments (subject to the GM’s discretion) and are quick to chide the summoner about such requests. In addition, should the action of the summoner cause a shift in alignment such that the summoner’s alignment is more than one step away from the eidolon’s, the eidolon refuses the call of the summoner (although the summoner can still use his summon monster class feature). If the summoner manages to restore his alignment, the eidolon returns to his service.

Agathion

Source Pathfinder Unchained pg. 29 (Amazon)
Patient and enlightened liaisons of the good-aligned Outer Planes, agathion eidolons seek to vanquish evil and protect that which is good. Agathion eidolons always have aspects of a single animal or creature, rather than a hodgepodge of several. Though they have patience for summoners with unorthodox methods and even those who stray from the path of good, they will not brook their powers being used for evil ends. An agathion eidolon seeks to bring its summoner closer to its own enlightenment.

Alignment: Neutral good.

Base Form: Biped (claws, limbs [arms], limbs [legs]) or quadruped (limbs [legs, 2], bite).

Base Evolutions: Starting at 1st level, agathion eidolons gain the resistance (electricity) evolution. They also gain a +4 bonus on saving throws against poison and petrification.

At 4th level, agathion eidolons gain cold resistance 10 and sonic resistance 10.

At 8th level, agathion eidolons gain lay on hands as paladins with levels equal to their Hit Dice.

At 12th level, agathion eidolons gain DR 5/evil. They also gain immunity to petrification and the truespeech ability (see the agathion subtype on page 306 of Pathfinder RPG Bestiary 2).

At 16th level, agathion eidolons lose the resistance (electricity) evolution, and instead gain the immunity (electricity) evolution. They also gain the agathion’s speak with animals ability (see the agathion subtype on page 306 of Bestiary 2).

At 20th level, agathion eidolons gain detect thoughts as a spell-like ability at will and also increase their damage reduction to DR 10/evil.

Ancestor

Source Blood of the Beast pg. 31
Whether created by bonding with the soul of a petitioner that was the summoner’s ancestor in life or calling upon the impressions of such a soul left behind on the Ethereal Plane or the Akashic Record, ancestor eidolons are outsiders cast in the mold of mortals, and exhibit extraordinary skill and talent. They usually appear as idealized versions of the bodies they possessed while still alive, but distinctive and proud. Ancestor eidolons lend whatever aid they can to their summoner, who typically has some form of familial connection with the eidolon, be it by blood, honor, or devotion.

Alignment: Any. Ancestor eidolons don’t have any alignment subtypes.

Base Form: Biped (limbs [arms], limbs [legs]).

Base Evolutions: At 1st level, an ancestor eidolon gains all of the racial traits associated with its summoner’s race; a summoner who isn’t a 0-Hit Die creature must choose one 0-Hit Die race of his choice from the Pathfinder RPG Core Rulebook. For any effect dependent on class level, an ancestor eidolon uses its total Hit Dice instead (such as with the human’s skilled racial trait). An ancestor eidolon counts as a creature of its chosen race’s type and subtype for all effects, except for the purpose of meeting feat prerequisite requirements. An ancestor eidolon gains only the standard racial traits of its race; it cannot select alternate racial traits.

At 4th level, the ancestor eidolon chooses one of the following simple class templates (Pathfinder RPG Monster Codex 246): fighter, rogue, or sorcerer. It gains the abilities noted under the template’s quick rules as if it were a creature with 1 Hit Die. The eidolon does not gain any abilities that a character with 1 level in the class associated with the chosen template wouldn’t have. For instance, a 1-HD creature with the rogue simple template would normally gain the evasion and uncanny dodge abilities, but an ancestor eidolon that chooses the rogue simple template does not gain these abilities since a 1st-level rogue would not have evasion or uncanny dodge.

At 8th level, the ancestor eidolon gains the skilled evolution with two skills that are on the list of class skills of the class associated with the eidolon’s chosen simple class template.

At 12th level, the ancestor eidolon gains the abilities noted under its chosen simple class templates as if it were a creature with 5 Hit Dice, rather than 1 Hit Die. The eidolon doesn’t gain any abilities that a character with 5 levels in the class associated with the chosen template wouldn’t have.

At 16th level, the ancestor eidolon gains a bonus feat, chosen from the following list: Dodge, Great Fortitude, Improved Initiative, Iron Will, Lightning Reflexes, Toughness, or any feat that lists the eidolon’s chosen race as a prerequisite. The eidolon must meet all of the chosen feat’s prerequisites.

At 20th level, the ancestor eidolon gains the abilities noted under its chosen simple class templates as if it were a creature with 10 Hit Dice, rather than 5 Hit Dice. The eidolon doesn’t gain any abilities that a character with 10 levels in the class associated with the chosen template wouldn’t have.

Angel

Source Pathfinder Unchained pg. 30 (Amazon)
Hailing from the higher planes, angel eidolons are creatures of exquisite beauty. They usually appear in idealized humanoid forms, with smooth skin, shining hair, and bright eyes. Angel eidolons are impeccably honorable, trustworthy, and diplomatic, but they do not shy away from confrontation when facing off against evil and its minions.

Alignment: Any good.

Base Form: Biped (limbs [arms], limbs [legs], slam).

Base Evolutions: At 1st level, angel eidolons gain the resistance (acid) and resistance (cold) evolutions. They also gain a +4 bonus on saving throws against poison.

At 4th level, angel eidolons gain electricity resistance 10 and fire resistance 10.

At 8th level, angel eidolons grow large, feathery wings, gaining the flight evolution.

At 12th level, angel eidolons gain DR 5/evil. They also gain immunity to petrification and the truespeech ability (see the angel subtype on page 310 of the Bestiary).

At 16th level, angel eidolons lose the resistance (acid) and resistance (cold) evolutions, and instead gain the immunity (acid) and immunity (cold) evolutions.

At 20th level, angel eidolons gain the protective aura ability (see the angel subtype on page 310 of the Bestiary).

Archon

Source Pathfinder Unchained pg. 30 (Amazon)
Summoned from heaven, archon eidolons are the embodiments of righteousness. They often take on powerful, graceful forms, rippling with muscles but refined in their movements. Archon eidolons are totally dedicated to the cause of good, and have little patience for those who violate their oaths and ideals—including the summoner who called them. Archons will do whatever it takes to stop the advance of evil and protect the innocent.

Alignment: Lawful good.

Base Form: Biped (limbs [arms], limbs [legs], slam).

Base Evolutions: At 1st level, archon eidolons gain the resistance (electricity) evolution and the skilled (Intimidate) evolution. They also gain a +4 bonus on saving throws against poison.

At 4th level, archon eidolons add 1 point to their evolution pools.

At 8th level, archon eidolons gain the ability increase evolution, applied to an ability score the summoner chooses.

At 12th level, archon eidolons gain DR 5/evil. They also gain immunity to petrification and the truespeech ability (see the archon subtype on page 310 of the Bestiary).

At 16th level, archon eidolons lose the resistance (electricity) evolution and skilled (Intimidate) evolution, and instead gain the immunity (electricity) evolution. In addition, they gain the aura of menace ability (see the archon subtype on page 310 of the Bestiary).

At 20th level, archon eidolons gain the ability to use greater teleport at will, as the spell (caster level 14th), except they can teleport only themselves and up to 50 pounds of carried objects.

Azata

Source Pathfinder Unchained pg. 30 (Amazon)
Embodiments of the untamable beauty and noble passion of Elysium, azata eidolons have wild and beautiful features. They often take graceful forms reminiscent of elves or fey, but they occasionally appear like lillends, with serpentine tails. Azata eidolons are flighty and independent, and they often have their own ideas about how to defeat evil or have a good time. Thus, an azata eidolon is likely to balk if its summoner commands it to perform offensive or nefarious actions. On the other hand, an azata eidolon in sync with its summoner is a passionate and devoted companion.

Alignment: Chaotic good.

Base Form: Biped (limbs [arms], limbs [legs]) or serpentine (limbs [arms], tail, tail slap).

Base Evolutions: At 1st level, azata eidolons gain the resistance (electricity) evolution and the 4-point weapon training evolution (proficiency in martial weapons).

At 4th level, azata eidolons gain cold resistance 10 and fire resistance 10.

At 8th level, azata eidolons grow large, feathery wings, gaining the flight evolution.

At 12th level, azata eidolons gain DR 5/evil. They also gain immunity to petrification and the truespeech ability (see the azata subtype on page 311 of the Bestiary).

At 16th level, azata eidolons lose the resistance (electricity) evolution, and instead gain the immunity (electricity) evolution. They also gain the ability increase evolution, applied to an ability score of the summoner’s choice.

At 20th level, an azata eidolon gains the ability to switch between its normal form and an energy form as a standard action. In its energy form, an azata eidolon is incorporeal and doubles its fly speed, but it can’t make natural or manufactured weapon attacks; it can, however, activate any spell-like ability evolutions it possesses.

Daemon

Source Pathfinder Unchained pg. 31 (Amazon)
The agents of horrible deaths, daemon eidolons desire the utter annihilation of all things. Their forms vary wildly depending on which type of death they embody, and daemon eidolons sometimes represent a more obscure kind of death than the most famous daemons. Daemon eidolons wish to sow death and misery through a variety of means. Most are capable of seeing the big picture, and will obediently follow even a neutral summoner. Ending lives is a typical part of an adventurer’s career, so following along with a summoner gives a daemon eidolon many opportunities to gather mortal soul energy for its own dark and inscrutable purposes.

Alignment: Neutral evil.

Base Form: Biped (claws, limbs [arms], limbs [legs]), quadruped (limbs [legs, 2], bite), or serpentine (bite, reach [bite], reach [sting], sting, tail).

Base Evolutions: Starting at 1st level, daemon eidolons gain the resistance (acid) evolution as well as a +4 bonus on saving throws against death effects, disease, and poison.

At 4th level, daemon eidolons gain cold resistance 10, electricity resistance 10, and fire resistance 10.

At 8th level, daemon eidolons add 1 point to their evolution pools.

At 12th level, daemon eidolons gain DR 5/good. They also gain immunity to death effects, disease, and poison.

At 16th level, daemon eidolons lose the resistance (acid) evolution, and instead gain the immunity (acid) evolution. They also gain telepathy (Bestiary 305).

At 20th level, as a standard action, a daemon eidolon can devour a portion of the soul of a dying creature or a creature that died no earlier than 1 round ago. This kills the creature and provides the daemon eidolon a profane bonus on attack rolls, saving throws, and skill checks for 24 hours. The bonus is equal to +1 per 5 Hit Dice the slain creature possessed. A creature whose soul was devoured in this way requires resurrection or more powerful magic to return from the dead.

Demon

Source Pathfinder Unchained pg. 31 (Amazon)
Raw destruction given material substance, demon eidolons form out of the Abyss’s stew of soul energy, leading some scholars to speculate that the summoner’s arts are related to the magical tampering that gave rise to the first demons. Demon eidolons revel in causing destruction and inflicting suffering, and they will do so for their summoners without question, taking pleasure in whatever havoc they can create. For a demon eidolon, the means justify the ends.

Alignment: Chaotic evil.

Base Form: Biped (claws, limbs [arms], limbs [legs]), quadruped (limbs [legs, 2], bite), or serpentine (bite, improved damage [bite], reach [bite], tail, tail slap).

Base Evolutions: Starting at 1st level, demon eidolons gain the resistance (electricity) and resistance (fire) evolutions as well as a +4 bonus on saving throws against poison.

At 4th level, demon eidolons gain acid resistance 10 and cold resistance 10.

At 8th level, demon eidolons lose the +4 bonus on saving throws against poison and gain immunity to poison. They also add 1 point to their evolution pools.

At 12th level, demon eidolons gain DR 5/good. They also gain the ability increase evolution in an ability score of the summoner’s choice.

At 16th level, demon eidolons lose the resistance (electricity) evolution, and instead gain the immunity (electricity) evolution. They also gain telepathy (Bestiary 305).

At 20th level, demon eidolons gain true seeing as a constant spell-like ability.

Devil

Source Pathfinder Unchained pg. 32 (Amazon)
Corruptors, tempters, and despoilers, devil eidolons often serve their summoners obediently and efficiently, all in a long-term attempt to damn the summoner’s soul to the deepest depths of Hell. While some types of devils have truly unusual forms, devil eidolons have found that the more traditional bipedal form allows them to build up a strong rapport with their summoners—and consequently to corrupt them—more easily than if they possessed a more monstrous appearance.

Alignment: Lawful evil.

Base Form: Biped (claws, limbs [arms], limbs [legs]).

Base Evolutions: Starting at 1st level, devil eidolons gain the resistance (fire) evolution and the skilled (Bluff ) evolution. They also gain a +4 bonus on saving throws against poison.

At 4th level, devil eidolons gain acid resistance 10 and cold resistance 10.

At 8th level, devil eidolons gain the skilled (Diplomacy) evolution and gain immunity to poison.

At 12th level, devil eidolons gain DR 5/good. They also gain see in darkness (see the devil subtype on page 311 of the Bestiary).

At 16th level, devil eidolons lose the resistance (fire) evolution, and instead gain the immunity (fire) evolution. They also gain telepathy (Bestiary 305).

At 20th level, devil eidolons gain regeneration 5 (good weapons, good spells). They are still banished to Hell as normal for eidolons if they take enough damage.

Div

Source Pathfinder Unchained pg. 32 (Amazon)
Formed of hatred and spite, div eidolons seek to despoil and ruin all things beautiful and joyous. Div eidolons particularly resent having mortal masters, and seek to doom their summoners to existences full of suffering and loss. Each div eidolon has a unique compulsion it must follow—usually something similar to the doru’s obsession with secrets—that leads it to bargain its loyalty for something the summoner provides. The div’s summoner uses his eidolon’s compulsion to entrap and control the eidolon. Still, div eidolons never fully give in, and continue to plot ways they might corrupt that which their masters hold dearest.

Alignment: Neutral evil.

Base Form: Biped (claws, limbs [arms], limbs [legs]).

Base Evolutions: Starting at 1st level, div eidolons gain the resistance (fire) evolution. They also gain a +4 bonus on saving throws against poison.

At 4th level, div eidolons gain acid resistance 10 and electricity resistance 10.

At 8th level, div eidolons add 1 point to their evolution pools and immunity to poison.

At 12th level, div eidolons gain DR 5/good. They also gain see in darkness (see the div subtype on page 305 of Pathfinder RPG Bestiary 3).

At 16th level, div eidolons lose the resistance (fire) evolution, and instead gain the immunity (fire) evolution. They also gain telepathy (Bestiary 305).

At 20th level, div eidolons gain the ability to use greater teleport at will, as per the spell (caster level 14th), except they can teleport only themselves and up to 50 pounds of carried objects.

Elemental

Source Pathfinder Unchained pg. 33 (Amazon)
Pulled in from one of the four elemental planes, these eidolons are linked to one of the four elements: air, earth, fire, or water. Generally, an elemental eidolon appears as a creature made entirely of one element, but there is some variation. Elemental eidolons are decidedly moderate in their views and actions. They tend to avoid the conf licts of others when they can and seek to maintain balance. The only exception is when facing off against emissaries of their opposing elements, which they hate utterly.

Alignment: Neutral.

Base Form: Biped (limbs [arms], limbs [legs], slam), quadruped (limbs [legs, 2], bite), or serpentine (bite, improved natural armor, reach [bite], tail, tail slap).

Base Evolutions: The base evolutions of an elemental eidolon depend entirely on its chosen element. When first summoning an elemental eidolon, the summoner must select air, earth, fire, or water. Once made, this choice cannot be changed. The eidolon gains the following evolutions and abilities, which can vary depending on its element.

At 1st level, all elemental eidolons gain immunity to paralysis and sleep. In addition, air elemental eidolons gain the immunity (electricity) evolution. Earth elemental eidolons gain the immunity (acid) evolution. Fire elemental eidolons gain the immunity (f ire) evolution. Water elemental eidolons gain the immunity (cold) evolution.

At 4th level, all elemental eidolons add 1 point to their evolution pools.

At 8th level, air elemental eidolons gain the flight evolution (using magic) with a speed equal to their base speed. Earth elemental eidolons gain the burrow evolution. Fire elemental eidolons increase their base speed by 20 feet. Water elemental eidolons gain the swim evolution twice, gaining a swim speed equal to their base speed + 20 feet. They also gain the gills evolution, which allows them to breathe underwater.

At 12th level, all elemental eidolons gain immunity to bleed, poison, and stun. In addition, they can no longer be flanked.

At 16th level, all elemental eidolons gain immunity to critical hits and do not take additional damage from precision-based attacks, such as sneak attack.

At 20th level, an air elemental eidolon gains the whirlwind ability (Bestiary 306), with a maximum height of 15 feet (30 feet for a Large air elemental) and dealing 1d6 points of damage (1d8 for a Large air elemental). Earth elemental eidolons gain the earth mastery ability (Bestiary 122) and DR 5/—. Fire elemental eidolons gain the energy attacks (fire) evolution and the burn ability (Bestiary 298). Water elemental eidolons gain the drench and vortex abilities (Bestiary 126). The vortex ability works as the air elemental eidolon’s whirlwind ability (except as noted in the vortex ability’s description).

Fey

Source Ultimate Intrigue pg. 71
Fey eidolons are whimsical and mysterious creatures, prone to flights of fancy, odd compulsions, and alien humor. While some creatures from the faerie realms have truly unusual shapes, the ones close enough to the human mind to serve as eidolons tend to look like idealized humanoids with unusual features that set them apart, such as pointed ears or gossamer wings.

Fey eidolons usually choose to bond with mortals for their own mysterious reasons that vary as much as their disparate temperaments; occasionally, their need may be immediate, such as when a dryad whose tree is dying decides to bond with a summoner instead and become something new. On the other hand, a redcap just looking for bloodshed might connect with an equally sadistic summoner. Whatever their reasons, they tend to have strong bonds of loyalty to their summoners entangled with equally strong emotional attachments, even evil fey eidolons.

Alignment: Any. Fey eidolons don’t have alignment subtypes.

Base Form: Base Form: Biped (limbs [arms], limbs [legs]).

Base Evolutions: Starting at 1st level, fey eidolons gain Acrobatics, Diplomacy, Disguise, Escape Artist, Knowledge (nature), Perform, Sleight of Hand, and Use Magic Device as class skills instead of those gained by most eidolons. They also gain the low-light vision evolution, the skilled evolution (selecting one class skill), and the ability to use either dancing lights, detect magic, ghost sound, or prestidigitation at will as a spell-like ability. Once the summoner selects this and any other spell-like abilities for his fey eidolon, the selection cannot be changed.

At 4th level, fey eidolons gain woodland stride (as the druid ability).

At 8th level, fey eidolons gain the ability to use either charm person, entangle, grease, silent image, obscuring mist, or vanishAPG as a spell-like ability three times per day, and they can select an additional spell-like ability from the 1st-level list.

At 12th level, fey eidolons gain DR 5/ cold iron. They also grow gossamer wings, gaining the flight evolution.

At 16th level, fey eidolons gain the ability to use either blindness/deafness, detect thoughts, glitterdust, hideous laughter, invisibility (self only), minor image, mirror image, or tongues as a spell-like ability three times per day. They also can select an additional spell-like ability from the 1stlevel list or the 8th-level list.

At 20th level, fey eidolons increase their DR to DR 10/cold iron. They gain the ability to use either mass suggestion, mislead, programmed image, or veil as a spell-like ability once per day. They also can select an additional spell-like ability from the 1st-level list, the 8th-level list, or the 16th-level list.

Inevitable

Source Pathfinder Unchained pg. 33 (Amazon)
Implacable and ceaseless in their fight against chaos and those who break natural laws, inevitables make loyal, if literal-minded, companions for lawful summoners. Summoners of inevitables generally get along well with axiomites, who share their understanding of the process of forging and modifying an inevitable. Inevitable eidolons appear as a mixture between clockwork constructs and idealized humanoid statues.

Alignment: Lawful neutral.

Base Form: Biped (limbs [arms], limbs [legs], slam).

Base Evolutions: At 1st level, inevitable eidolons count as both constructs and outsiders for the purpose of effects such as the bane weapon special ability and the favored enemy class feature. They gain a +4 bonus on saving throws against death effects, disease, necromancy effects, paralysis, poison, sleep, and stun.

At 4th level, inevitable eidolons gain a +4 bonus on saving throws against mind-affecting effects and immunity to nonlethal damage, fatigue, and exhaustion.

At 8th level, inevitable eidolons gain immunity to death effects, disease, and poison.

At 12th level, inevitable eidolons gain DR 5/chaotic. They also gain immunity to sleep, as well as the true speech ability (see the inevitable subtype on page 307 of Bestiary 2).

At 16th level, inevitable eidolons lose the +4 bonus on saving throws against necromancy effects and gain immunity to ability damage, ability drain, energy drain, and necromancy effects.

At 20th level, inevitable eidolons gain immunity to paralysis, sleep, stun, and any effect that requires a Fortitude save (unless the effect also works on objects).

Protean

Source Pathfinder Unchained pg. 33 (Amazon)
Serpentine beings of pure chaos, proteans seek to reshape reality. Protean eidolons appreciate creative summoners who often rebuild their forms and make liberal use of the transmogrify spell. Beyond that, protean eidolons are happy to work with their summoners for any purpose, though they are quick to remind their summoners that while they have a mutually benef icial relationship, they are not servants.

Alignment: Chaotic neutral.

Base Form: Serpentine (bite, grab [tail slap], tail, tail slap).

Base Evolutions: At 1st level, protean eidolons gain the resistance (acid) evolution as well as the grab evolution, tied to an attack type of the summoner’s choice. Whenever the summoner changes the protean eidolon’s evolutions, he can also change the attack type for grab.

At 4th level, protean eidolons gain electricity resistance 10 and sonic resistance 10.

At 8th level, protean eidolons gain the constrict evolution.

At 12th level, protean eidolons gain DR 5/lawful. They also gain the blindsense evolution and the ability to fly without wings with perfect maneuverability, as the flight evolution with 4 points spent.

At 16th level, protean eidolons lose the resistance (acid) evolution and instead gain the immunity (acid) evolution. They also gain the amorphous anatomy ability (see the protean subtype on page 308 of Bestiary 2).

At 20th level, protean eidolons gain constant freedom of movement and the protean version of the change shape (greater polymorph) ability (see the protean subtype on page 308 of Bestiary 2).

Psychopomp

Source Pathfinder Unchained pg. 34 (Amazon)
Stewards, chroniclers, and guides of all things that die, psychopomps make dispassionate yet loyal eidolons. When they deal with the world of mortals, psychopomp eidolons nearly always wear masks. They do not tolerate summoners who traffic with daemons, undead, and other entities that interfere with the transmigration of souls, but otherwise they are comfortable with most actions on the summoner’s part. When the summoner dies, a psychopomp eidolon personally escorts him to the afterlife and serves as an expert witness when it is time for him to be judged.

Alignment: Neutral.

Base Form: Biped (limbs [arms], limbs [legs], slam), quadruped (bite, limbs [legs, 2]), or serpentine (bite, pull [bite], reach [bite], tail, tail slap).

Base Evolutions: Starting at 1st level, psychopomp eidolons gain immunity to death effects, disease, and poison.

At 4th level, psychopomp eidolons gain cold resistance 10 and electricity resistance 10.

At 8th level, psychopomp eidolons gain the spirit touch ability (see the psychopomp subtype on page 308 of Pathfinder RPG Bestiary 4) and add 1 point to their evolution pools.

At 12th level, psychopomp eidolons gain DR 5/adamantine. They also gain the spiritsense ability (see the psychopomp subtype on page 308 of Bestiary 4).

At 16th level, psychopomp eidolons gain the ability increase evolution, applied to an ability score of the summoner’s choice. They also gain the ability to cast invisibility (self only) as a spell-like ability at will.

At 20th level, psychopomp eidolons increase their damage reduction to 10/adamantine and gain the immunity (cold) and immunity (electricity) evolutions.

Shadow

Source Blood of Shadows pg. 11
Shadow is a new eidolon subtype available to the variant of the summoner class presented in Pathfinder RPG Pathfinder Unchained. Summoned from the dreary shadowscapes of the Shadow Plane, shadow eidolons are grim, colorless mockeries of creatures that inhabit the Material Plane. Shadow eidolons resent being pulled into the unbearable brightness of the Material Plane. Despite this, shadow eidolons serve their summoners with somberness, acknowledging that shadow cannot exist without light.

Alignment: Any nongood.

Base Form: Biped (claws, limbs [arms], limbs [legs]), quadruped (limbs [legs, 2], bite), or serpentine (bite, improved natural armor, reach [bite], tail, tail slap).

Base Evolutions: At 1st level, shadow eidolons gain the resistance (cold) and resistance (electricity) evolutions. They also gain the ability to cast darkness as a spell-like ability three times per day. The caster level for this spell-like ability is equal to the eidolon’s Hit Dice.

At 4th level, shadow eidolons effortlessly blend into the shadows, giving them concealment (20% miss chance) in any illumination other than bright light. In dim light or darkness, shadow eidolons have a 50% miss chance instead of the normal 20% miss chance; this doesn’t grant the eidolons total concealment. A shadow eidolon can suspend or resume this ability as a free action.

At 8th level, shadow eidolons gain DR 5/magic and increase the range of their darkvision to 90 feet. In addition, they add 1 point to their evolution pools.

At 12th level, shadow eidolons lose the ability to cast darkness as a spell-like ability and instead gain the ability to cast deeper darkness as a spell-like ability three times per day. In addition, they gain the see in darkness universal monster ability.

At 16th level, shadow eidolons’ damage reduction increases to DR 10/magic and they gain the spell resistance evolution.

At 20th level, shadow eidolons increase the range of their darkvision to 120 feet and gain the ability to cast shadow step as a spell-like ability at will. Three times per day, a shadow eidolon can quicken this spell-like ability, functioning as the Quicken Spell-Like Ability feat.