Revilock

Camouflage. The grimlock has advantage on Stealth checks made to hide in rocky terrain.

Keen Hearing and Smell. The grimlock has advantage on Perception checks that rely on hearing or smell.

Psionic Spellcasting. The revilocks spellcasting ability is Intelligence (spell save DC 12). It can innately cast the following spells, requiring no components:

Spiked Club. Melee Weapon Attack: +4 to hit, reach 5 ft., one target. Hit: 4 (1d4 + 2) bludgeoning damage plus 2 (1d4) piercing damage.

Throttle. Melee Weapon Attack: +4 to hit, reach 5 ft., one creature. Hit: 4 (1d4 + 2) bludgeoning damage and the target is grappled (escape DC 12) and can't breathe. Until this grapple ends the grimlock can't use any attack other than throttle and only against the grappled target and it makes this attack with advantage.

Sling. Ranged Weapon Attack: +4 to hit, range 30/120 ft., one target. Hit: 4 (1d4 + 2) bludgeoning damage.