Dark Arts Player's Companion
Blood Seal
2nd Level Necromancy (Hemomancy)
Casting Time: 1 Bonus Action +10 minutes
Range: 30 ft
Components: V, S, M (an ornate dagger worth at least 25 gp)
Duration: 1 Hour
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.
Classes: Cleric, Way of the Bloodied Fist (Monk)*, Sorcerer, Wizard