Blackmane

Predators of Night and Shadows. Blackmane hunt unsuspecting people and prey, they gain expertise with the stealth skill, and can cast darkness at will and are imperious to its effects.

Infernal Fortitude. Every round this creature regains 2d10 + hit points each round.

Pack Tactics. The  Blackmane has advantage on an attack roll against a creature if at least one of the Blackmanes's allies is within 10 feet of the creature and the ally isn't incapacitated.

Innate Spellcasting. The Blackmane are 3rd-level spellcasters. Their spellcasting ability their Charisma (spell save DC 15, + 7 to hit with spell attacks). The Blackmane have following spells prepared:
Cantrips (at will): Poison spray, Eldritch blast, Blade ward

1st level spell slots (3): Arms of Hadar, Witchbolt

2nd level spell slots (2): Melf's Acid Arrow, Scorching ray

3rd level spell slots (2): Fireball, Animate Dead

Sunlight Sensitivity. While in sunlight, the drow has disadvantage on attack rolls, as well as on Wisdom (Perception) checks that rely on sight.

Multiattack. The Blackmane makes one attack with either its Withering Claw, or Ravenous Bite, and one with it's Reaper's Glare.

Ravenous Bite. Melee Attack: +7, to hit, reach 5 ft., 1 target. Hit: 10 (2d8 + 6) piercing damage, with an additional 2d6 poison damage. 

Withering Claw. Melee Attack: +7, to hit, reach 5 ft., 2 targets. Hit: 23 (3d12 +6) necrotic damage, plus 9 (1d6 + 6) slashing.

Reaper's Glare (Recharge 5-6). Range 25 ft, 1 target. The target must succeed on a DC 18 Wisdom saving throw or become frightened and paralyzed for 3 rounds, every fail you make you take 2d8 necrotic damage, 3 fails and you drop to zero hit points. If a creature's saving throw is successful or the effect ends for it, the creature is immune to the Blackmane's Reaper's Glare for the next 24 hours.

Frightful recovery. As a reaction to being hit a Blackmane can use it's Reapers Glare once per round.