Fearful Image. Any creature hostile to the abyssal dweller that can see it and that starts its turn within 20 feet of the abyssal dweller must make a DC 23 Wisdom saving throw, unless the abyssal dweller is incapacitated. On a failed save, the creature is frightened until the start of its next turn. If a creature's saving throw is successful, the creature is immune to the abyssal dweller's Fearful Image for the next 12 hours.

Magic Weapons. The abyssal dweller's weapon attacks are magical.

Innate Spellcasting. The abyssal dweller's spellcasting ability is Wisdom (spell save DC 23). The abyssal dweller can innately cast the following spells, requiring no material components:

At will: ray of sickness.

3/day each: arms of hadar (at 4th level).

2/day each: hunger of hadar

Devil's Sight. The abyssal dweller can see through magical and nonmagical darkness within a range of 200ft.

Multiattack. The abyssal dweller makes five attacks: one with its bite, two with its claws, and two with its tails.

Bite. Melee Weapon Attack: +15 to hit, reach 5 ft., one target. Hit: 30 (6d6 + 9) piercing damage. The target must succeed on a DC 23 Constitution saving throw or it takes 13 (3d6) necrotic damage and 9 (2d6) cold damage, or half as much damage on a successful save.

Claw. Melee Weapon Attack: +15 to hit, reach 10 ft., one target. Hit: 28 (4d8 + 9) slashing damage, plus 13 (3d6) necrotic damage and 9 (2d6) cold damage, or half as much damage on a successful save.

Tail. Melee Weapon Attack: +15 to hit, reach 10 ft., one target. Hit: 24 (4d6 + 9) bludgeoning damage, plus13 (3d6) necrotic damage and 9 (2d6) cold damage.