Death Blade (Variant)

You put necrotic power into a blade weapon. This spell does 12d12+15 necrotic damage plus the weapon normal damage. Anything killed with the weapon rises up as a undead under your control.

At Higher Levels. you deal addition 5d12 necrotic damage for every spell slot above 8th level. In addition you heal 4d4 every time you kill a creature with the weapon while this spell is still activated.