BrainWasher

Rampage. When the brainwasher reduces a creature to 0 hit points with a melee attack on its turn, the hyena can take a bonus action to teleport to half its speed.

Invisibility: Whenever you don't move, don't take any actions for a turn and didn't get hit by any source last turn, you become invisible.

Slash. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 15 (2d6 + 8) piercing damage.

Tether.Connect with an enemy (Wis. Saving throw DC 15). Once per turn whenever you take damage, the tether enemy take 1d6 necrotic damage. This connection lasts untill the creature dies or is further than 80 feet from you

Suck the wits:  Deal 1d4+3 necrotic damage to all tethered creatures and restore 1d4 hitpoints.

Pierce the mind: Range Attack on a Tethered Creature: +5 to hit, reach 80 ft., one target. Hit: 10 (2d6 + 3) piercing damage.

Blinding shadow: When an creature within 5 ft. misses you with an attack, you can give him disadvantage on the next saving throw it makes untill the end of your next turn.

Push: A creature must make a DC 14 Strength Saving throw. If it fails, it takes 1d4 necrotic damage and is pushed 10ft. away from you

Quick Slash: Melee Weapon Atack +5 to hit, reach 5 ft., one target. Hit: 11 (1d6 + 8) piercing damage.