Death Strike

You lash out with your weapon, using the blood spilled from your target to bolster your own health. As part of the action used to cast this spell, you must make a melee attack with a weapon against one creature within the spell's range, otherwise the spell fails. On a hit, the target suffers the attack's normal effects, and you gain temporary hitpoints equal to your Con modifier.

This spell's damage increases when you reach higher levels. At 5th level, the melee attack deals an extra 1d10 necrotic damage to the target and you gain temporary hitpoints equal to your Con modifier plus half the necrotic damage done. The damage increases to 2d10 at 11th level and 3d10 at 17th level.