Chittering Shadow Demon

Shadow Stealth. While in dim light or darkness, the demon can take the Hide action as a bonus action.

Magic Resistance. The demon has advantage on saving throws against spells and other magical effects.

Uncanny Armor. Creatures within 30 feet of the chittering shadow demon have disadvantage on all attacks rolls (unless attack includes radiant damage).

Multiattack. The Chittering Shadow Demon makes two melee attacks.

Claws. Melee Weapon Attack: +4 to hit, reach 5 ft., one target. 

Hit: 12 (3d6 + 2) slashing damage.

Shadow Clutch (Recharge 5-6). The demon targets a creature it can see within 30 feet. The target must succeed on a DC 13 Strength saving throw or be restrained by shadowy tendrils for 1 minute. The restrained target can repeat the saving throw at the end of each of its turns.

Innate Spellcasting. The Chittering Shadow Demon can cast Ray of Frost, using Wisdom as the spellcasting ability (spell save DC 12):