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Medium monstrosity (shapechanger), neutral
darkvision 60 ft.,
passive Perception 10
3 (700 XP)
The doppelganger can use its action to polymorph into a Small or Medium humanoid it has seen, or back into its true form. Its statistics, other than its size, are the same in each form. Any equipment it is wearing or carrying isn’t transformed. It reverts to its true form if it dies.
The doppelganger has advantage on attack rolls against any creature it has surprised.
If the doppelganger surprises a creature and hits it with an attack during the first round of combat, the target takes an extra 10 (3d6) damage from the attack.
The doppelganger makes two melee attacks.
Slam.Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 7 (1d6 + 4) bludgeoning damage.
The doppelganger magically reads the surface thoughts of one creature within 60 feet of it. The effect can penetrate barriers, but 3 feet of wood or dirt, 2 feet of stone, 2 inches of metal, or a thin sheet of lead blocks it. While the target is in range, the doppelganger can continue reading its thoughts, as long as the doppelganger’s concentration isn’t broken (as if concentrating on a spell). While reading the target’s mind, the doppelganger has advantage on Wisdom (Insight) and Charisma (Deception, Intimidation, and Persuasion) checks against the target.
Source:Pathfinder Roleplaying Game Bestiary.
Doppelgangers are strange beings that can take on the shapes of those they encounter. In its natural form, the creature looks more or less humanoid, but slender and frail, with gangly limbs and half-formed facial features. Its flesh is pale and hairless, and its eyes are vacant and white.
Doppelgangers prefer infiltrating societies where they can gather wealth and influence, and see little point in forming cities of their own kind. Younger doppelgangers practice their skills by taking over small orc or goblin tribes, then move to more complicated societies like dwarven, elven, and human communities. Rather than making themselves targets by taking positions of leadership, they prefer to be the power behind the throne, or use multiple identities to manipulate influential citizens or entire guilds.
Doppelgangers make excellent use of their natural mimicry to stage ambushes, bait traps, and infiltrate humanoid society. Although not usually evil, they are interested only in themselves and regard all others as playthings to be manipulated and deceived. They are particularly fond of invading human societies in order to indulge in their desires—some enjoy the complex dance of politics while others seek constant change in the race and gender of both themselves and their romantic companions. While not standard, it is those doppelgangers use their gifts for cruel and sadistic purposes that are most notorious, and these shapeshifters are the primary cause of the race’s sinister reputation. Certainly, a creature capable of changing its shape has a handy way to avoid capture for its crimes, and some particularly malicious doppelgangers enjoy disrupting relationships by posing as unfaithful lovers.
Rumors persist of even more powerful doppelgangers capable of not only shifting their appearance, but also skills, memories, and even the magical abilities of creatures whose forms they choose to mimic.