Robes of the Necromancer

(Requires Attunement)
Once per turn when you kill 1 or more creatures
with a spell of 1st level or higher, you regain hit
points equal to twice the spell's level, or three
times its level if the spell belongs to the School of Necromancy. You don’t gain this benefit for
killing constructs or undead. You have resistance
to Necrotic Damage while wearing this robe.
Curse: This item is cursed. As long as you remain cursed, whenever you regain hit points you regain
half as many rounded up.