Umbra-Doppelganger

Medium monstrosity (shapechanger)

Armor Class 16 (natural armor + Dex)
Hit Points 65 (10d8 + 20)
Speed 30 ft., 40 ft. in shadow

STR	DEX	CON	INT	WIS	CHA
11 (+0)	18 (+4)	14 (+2)	11 (+0)	12 (+1)	16 (+3)

Skills Deception +7, Insight +3, Perception +3
Condition Immunities charmed
Senses darkvision 120 ft., passive Perception 13
Languages Common, Eholan (Undercommon)
Challenge 4 (1,100 XP)
Proficiency Bonus +2

SPECIAL TRAITS

• 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.
• Ambusher. The doppelganger has advantage on attack rolls against any creature it has surprised.
• Gilded Tongue. The doppelganger always has advantage on Charisma (Deception) and Charisma (Persuasion) checks.
• Shadow Stealth. While in dim light or darkness, the doppelganger can take the Hide action as a bonus action.
• Sneak Attack (1/Turn). The doppelganger deals an extra 14 (4d6) damage when it hits a target with a weapon attack and has advantage on the attack roll, or when the target is within 5 feet of an ally of the spy that isn’t incapacitatedand the doppelganger doesn’t have disadvantage on the attack roll.

ACTIONS

• Multiattack. The doppelganger makes two melee attacks.
• Slam. Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 7 (1d6+4) bludgeoning damage.
• Mind Read. The doppelganger magically reads the surface thoughts of one creature within 60 feet of it, as well as any creatures within 30 feet that are in dim light or darkness. 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 a 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 a target’s mind, the doppelganger has advantage on Wisdom (Insight) and Charisma (Intimidation) checks against the target.