Transfusion of Life

You cut into your flesh, cut into another creature's flesh, and press the incisions together. The caster decides how many d4s of necrotic damage he will take, and the target is healed 2d6 hit points for every 1d4 necrotic damage the caster took. The caster may take some necrotic damage, then decide he is willing to take more. The target is only healed once the caster has decided he has taken enough damage. Once the spell completes, the target's incision stitches together.