Blood Seal

You inflict a wound upon yourself to create a protective seal on another creature within range. As you cast the spell, you choose a number of hit points to expend, the target then gains 1d6 + double the number of hit points expended 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 1d6 additional temporary hit points for each level above 2nd.