An Eye For An Eye Partial Sacrifice

Target and enemy. This enemy dies and you, and at least one randomly chosen party mate take the sane amount of damage as its hp was at the time of casting the spell. If the amount of health it had was divisible by the number of people in your party, then everyone in your party receives an equal share of the damage. If this kills a player or players so be it. If you and the other party member can't take all the damage, then another party member is chosen.  If they too can't survive the damage, another player is dealt some damage. If none of your partymates have enough hp left, this spell randomly kills one entity on either side of the encounter.