Shapechanger. The child of 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 attach rolls against any creature it has surprised.
Surprise Attack. If the doppelganger surprises a creature from an unseen position and hits it with an attack as a result, the target takes an extra 10 (3d6) damage from the attack.
Slash. Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 7 (1d6 + 4) slashing damage.
Bite. Melee Weapon Attack: +1 to hit, reach 5 ft., one target. Hit: 10 (1d6 +6) piercing damage.
Slippery Dash. Once hit with an attack, the doppelganger can use its reaction to move 40 ft away from the attacker.
Description
As the child of a Doppelganger Variant, these young creatures are white-skinned, thin-framed humanoid monstrosities of stretched skin and red eyes. They can shapeshift into any Medium or Small creature, taking on their form, voice and memories. These Variants like to observe targets, learning from their movements and behaviour before mimicking them. They appear faster than other Doppelgangers as languid and long-limbed creatures.
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