Blood Seal

You inflict a wound upon yourself to create a protective seal on another creature within range. As you cast the spell, you spend a number of hit points and the target gains 1d10 + the number of hit points spent as temporary hit points for the duration. At Higher Levels. When you cast this spell using a spell slot of 3rd level or higher, the target gains 1d10 additional temporary hit points for each slot level above 2nd.