Crucible Axe

Equipped Creature has +3/+3 and deals
an extra 2d10 Necrotic Damage.
The Necrotic Damage increase to 2d12 against Celestials.
Until your next turn, target has disadvantage on attacks that are not you, & deals 1/2 damage
to other creatures.
The effect ends early if you attack another target
before your next turn.
When an attack with this weapon kills a target,
regain HP equal to the Necrotic Damage dealt.