Alchemist | Antipaladin | Arcanist | Barbarian | Barbarian (Unchained) | Bard | Bloodrager | Brawler | Cavalier | Cleric | Druid | Fighter | Gunslinger | Hunter | Inquisitor | Investigator | Kineticist | Magus | Medium | Mesmerist | Monk | Monk (Unchained) | Ninja | Occultist | Oracle | Paladin | Psychic | Ranger | Rogue | Rogue (Unchained) | Samurai | Shaman | Shifter | Skald | Slayer | Sorcerer | Spiritualist | Summoner | Summoner (Unchained) | Swashbuckler | Vigilante | Warpriest | Witch | Wizard
Companion | Drake | Eidolon | Eidolon (Unchained) | Familiar | Phantom
Adept | Aristocrat | Commoner | Expert | Warrior

Ranger Class Details | Combat Styles | Traps | Archetypes

Infiltrator

Source Advanced Player's Guide pg. 125
Some rangers study their favored enemies and learn their ways, applying this knowledge to their own abilities and using their foes’ strengths against them. Infiltrators are willing to walk a mile in an enemy’s shoes so as to learn eveything there is to know about their foes in order to more effectively hunt and kill them.

Adaptation (Ex): At 3rd level, an infiltrator learns how to copy the unusual abilities of his prey. He chooses one type of creature he has selected as a favored enemy, such as “aberrations.” The ranger selects one ability or feat from the adaptation list for that type (see below). A ranger can use adaptations for 10 minutes per day per ranger level he possesses. This duration does not need to be consecutive, but it must be used in 10-minute increments. If the adaptation requires the ranger to make a more specific choice (such as what skill to use with Skill Focus), this choice is permanent and cannot be changed.

At 8th, 13th, and 15th-level, the ranger chooses another one of his favored enemy types and selects one adaptation from that type's list, as well as an additional adaptation from any one list of a creature type he's selected (including the one just chosen, if so desired). The infiltrator can only use one adaptation at a time. This class ability replaces favored terrain. The ranger can use the camouflage and hide in plain sight class features whenever he is using adaptations.

Aberration: amphibious, darkvision 60 ft., Iron Will, natural armor +2.
Animal: climb 15 ft., darkvision 60 ft., Great Fortitude, Lightning Reflexes, low-light vision, natural armor (+2), swim 15 ft.
Construct: darkvision 60 ft., Great Fortitude, Lightning Reflexes, low-light vision.
Dragon: darkvision 60 ft., Great Fortitude, Iron Will, Lightning Reflexes, low-light vision, Lunge.
Fey: Iron Will, Lightning Reflexes, low-light vision.
Humanoid (aquatic): low-light vision, natural armor +2, darkvision, swim 15 ft.
Humanoid (dwarf): darkvision 60 ft., defensive training, greed, hatred, hardy, slow and steady, stability, stonecunning, weapon familiarity.
Humanoid (elf): elf blood, low-light vision, elven immunities, elven magic, keen senses, Skill Focus (choose one skill), weapon familiarity.
Humanoid (giant): low-light vision, Lunge, natural armor +2, resist energy 10 (choose cold, electricity, or fire), Throw Anything.
Humanoid (gnoll): darkvision 60 ft., Exotic Weapon Proficiency (dire flail), natural armor +2.
Humanoid (gnome): defensive training, gnome magic, hatred, illusion resistance, keen senses, low-light vision, obsessive, weapon familiarity.
Humanoid (goblinoid): darkvision 60 ft., goblin fast, Skill Focus (Stealth), natural armor (+2).
Humanoid (halfling): fearless, halfling luck, keen senses, sure-footed, weapon familiarity.
Humanoid (human): Great Fortitude, Iron Will, Lightning Reflexes, Skill Focus (choose one skill).
Humanoid (orc): darkvision 60 ft., ferocity, intimidating, orc blood, weapon familiarity.
Humanoid (reptilian): darkvision 60 ft., kobold fast (as goblin fast), lizardfolk hold breath, natural armor +2, Skill Focus (choose Acrobatics, Perception, or Stealth).
Magical Beast: darkvision 60 ft., Great Fortitude, low-light vision, natural armor +2.
Monstrous Humanoid: darkvision 60 ft., Lightning Reflexes, low-light vision, natural armor +2.
Ooze: acid resistance 10, Great Fortitude, Iron Will, Skill Focus (choose Climb, Escape Artist, or Perception).
Outsider: darkvision 60 ft., energy resistance 5 (choose one type of energy from acid, cold, electricity, or fire), Great Fortitude, Iron Will, Lightning Reflexes.
Plant: low-light vision, Great Fortitude, Iron Will.
Undead: darkvision 60 ft., Great Fortitude, Iron Will, natural armor (+2). Skill Focus (Stealth).
Vermin: climb 15 ft., darkvision 60 ft., Great Fortitude, Iron Will, swim 15 ft.