Apathy Horde

Claw (Fiend Form Only). Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 6 (1d6 + 3) slashing damage.

Scream of Apathy. One humanoid the fiend can see within 30 feet of it must succeed on a DC 10 Wisdom saving throw or be magically Frightened until gets out of range of the attack or until the creature is killed.

Draining Scream. The fiend screams covering a 15ft radius . The targets must make a DC 10 Constitution saving throw against this magic, taking 10 (1d6 + 4) psychic damage on a failed save, or half as much damage on a successful one. The target's hit point maximum is reduced by an amount equal to the damage taken. This reduction lasts until the target finishes a long rest. The target dies if this effect reduces its hit point maximum to 0.