Essence Blade

A ghastly teal flame takes form on your weapon, on hit, the creature takes normal damage. with an additional 3d8 Necrotic damage.

If you defeat an enemy with this spell, you absorb their soul, and gain 1d4 +spell casting modifier temporary hit points.

At Higher Levels. When you cast this spell using a spell slot of 3rd level or higher, the extra damage increases by 1d8 for each slot level above 2nd.