Life Essence Harvest is a passive feature that causes creatures killed by spells to give the wielder Spell Slots. They can only be used for Necromancy Spells.
Description
When the wielder kills a hostile creature with a spell, they greedily absorb its energy and gain 
until their next Long Rest.
Condition: Life Essence
Duration: Until Long rest
- Affected entity has absorbed a creature's essence. It can use that essence to cast any Necromancy spell without consuming a spell slot.
