Life Drain

Melee Weapon Attack: +8 to hit, reach 5 ft., one target. Hit: 36 (7d8 + 5) necrotic damage. The target must succeed on a DC 15 Constitution saving throw, or its 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.

Create Deathwisp

The deathwisp targets a humanoid within 10 feet of it that died violently less than 1 minute ago. The target's spirit rises as a wraith in the space of its corpse or in the nearest unoccupied space. This wraith is under the deathwisp's control. The deathwisp can keep no more than five wraiths under its control at one time.