Actions

Multiattack: the doppelganger makes two melee attacks   claws: +6, 5 ft, 1d6+4S   Terrifying Gaze: as an action, the doppelganger opens all of its eyes, focusing them intensely on a target within 30ft, you can force the target to make a Wisdom saving throw. On a failed save, the target becomes frightened of you for 1 minute. The frightened target can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success.   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 advantage on Wisdom (Insight) and Charisma (Deception, Intimidation, and Persuasion) checks against the target.

Usual Tactics

stalking and ambush tactics. if cornered, they usually rely on their terrifying gaze ability to flee

Suggested Environments

they can appear just about anywhere, but they are most often found in forests and near the edged of civillization