Summon Umbra (5e Spell)
From D&D Wiki
|Casting time:||1 bonus action|
|Components:||V, S, M (a melee weapon)|
You turn your blade into an aspect of Umbra, a sentient weapon. The blade deals 1d8 slashing damage. On a critical hit the blade deals an extra 1d4 psychic or necrotic damage (your choice). When you slay an enemy with the blade you absorb their life force and regain temporary hit points equal to half the damage dealt. You may use the blade as a melee attack or melee spell attack. You can dismiss the blade as a bonus action.
At Higher Levels. The blade's damage increases by 1d8 when you reach 5th level (2d8), 11th level (3d8), and 17th level (4d8). The critical hit damage also increases by 1d4 when you reach 5th level (2d4), 11th level (3d4), and 17th level (4d4).Any additional damage dice can be split as you desire among slashing or necrotic damage.