Doppelganger

Doppelgangers are devious shapeshifters that take on the appearance of other humanoids, throwing off pursuit or luring victims to their doom with misdirection and disguise. Few creatures spread fear, suspicion, and deceit better than doppelgangers. Found in every land and culture, they can take on the guise of any individual of any race.
Stealing Secrets A doppelganger's adopted form allows it to blend into almost any group or community, but its transformation doesn't impart languages, mannerisms, memory, or personality. Doppelgangers often follow or capture creatures they intend to impersonate, studying them and probing their minds for secrets. A doppelganger can read a creature's surface thoughts, allowing it to glean that creature's name, desires, and fears, along with a few scattered memories. A doppelganger impersonating a specific creature as part of a long-term plot might keep its double alive and close at hand for weeks, probing the victim's mind daily to learn how to behave and speak authentically.
Hedonistic Swindlers Doppelgangers work alone or in small groups, with group roles shifting from con to con. While one doppelganger takes the place of a murdered merchant or noble, the others take on a number of identities as circumstances warrant, playing the parts of family or servants while they live off the victim's riches.
Changelings Doppelgangers are too lazy or self interested to raise their young. They assume attractive male forms and seduce women, leaving them to raise their progeny. A doppelganger child appears to be a normal member of its mother's species until it reaches adolescence, at which point it discovers its true nature and is driven to seek out its kind to join them.

Doppelganger

Doppelgangers are devious shapeshifters that take on the appearance of other humanoids, throwing off pursuit or luring victims to their doom with misdirection and disguise. Few creatures spread fear, suspicion, and deceit better than doppelgangers. Found in every land and culture, they can take on the guise of any individual of any race.

---

Armor Class	14
Hit Points	8d8+16
Speed	30ft.
Strength	11 (+0)
Dexterity	18 (+4)
Constitution	14 (+2)
Intelligence	11 (+0)
Wisdom	12 (+1)
Charisma	14 (+2)
Skills	Deception d20+6	Insight d20+3
Condition Immunities	Charmed
Senses	Darkvision 60ft.	Passive Perception 11
Languages	Common
Challenge	3 (700 XP)
Special 1	Shapechanger	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
Special 2	Ambusher	The doppelganger has an advantage on attack rolls	against any creature it has surprised
Special 3	Surprise Attack	If the doppelganger surprises a creature and hits it with an attack	during the first round of combat,
the target takes an extra 3d6 damage from the attack
Action 1	Multiattack	The doppelganger makes two melee attacks
Action 2	Slam	Melee Weapon Attack	d20+6 to hit
Reach 5 ft., one target	Hit 1d6+4 bludgeoning damage
Action 3	Read Thoughts	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 an advantage on Wisdom (Insight)	and Charisma (Deception, Intimidation, and Persuasion) checks against the target