Shadow demon

Shadow demons are a type of fiend that feed on people's fears. In the distant past, they were prevented from reforming in the Abyss, making their essence sometimes appear as a vague physical form and, since their creation results most often from mortal magic, not from transformation or promotion, shadow demons are outcasted from the abyssal hierarchy.

Appearance
In Dungeons & Dragons lore, shadow demons are amorphous, but appear as winged humanoids with diaphanous lower halves when exposed to bright light. Orthax appeared as having a vaguely humanoid outline but with a birdlike face, with a bottom half disappearing into smoke.

Abilities

 * Light Sensitivity: The demon has disadvantage on Perception checks and attack rolls while in bright light.
 * Incorporeal Movement: The demon can move through solid matter as if they were difficult terrain. It takes 1d10 force damage if it ends its turn inside an object.
 * Shadow Stealth: While in dim light or darkness, the demon can take the Hide action as a bonus action.
 * Some shadow demons can possess people and briefly dominate them.

Action:
 * Multiattack: The demon makes three claw attacks.
 * Claw: Shadow demon attacks has +5 to hit, reach 5 ft., dealing 2d6+3 psychic damage or, if the demon had advantage on the attack roll, 4d6+3 psychic damage.

Known s

 * Orthax, a shadow demon who made a pact with Percival de Rolo and showed Percy how to make his first gun.
 * Trush, patron of Bol'bara, a seer from Urzin.
 * Shadow demons are also commonly found in the Umbra Hills, likely due to the quantity of demonic ichor spilled in the region.