Draining Touch

Your touch can drain the vigor from a creature's soul. Make a melee spell attack against a creature within your reach. On a hit, the target takes 1d8 necrotic damage. If the target dies from this damage you gain temporary Hit Points equal to half the damage dealt (round down), as you drain some of its soul essence.

The spell's damage increases by 1d8 when you reach 5th level (2d8), 11th level (3d8), and 17th level (4d8).