Sanguine Sorcery

You can siphon off your own life force and the life force of a number of willing participants to cast more spells. Once per round, in place of using a spell slot, you may split a determined amount damage among a number of willing participants including yourself within 90 feet of you. The maximum number of willing participants is determined by the spell level. If a wiling participant's hit points fall below 0 the spell is canceled and standard rules apply.