Curse of the Ultimate Sacrifice

For when you're desperate for high damage, and trust the party to have your back. Reduce your hitpoints from the current total down to 1, and reduce a single target that you can make eye contact with by that same number. The spell is guaranteed to hit, however a devastating curse holds on to you, and you are unable to be healed by any healing magic, abilities or magic items until you take a long rest, unless your hitpoints drop to 0, then you can be healed back to a single point, and no further, no matter what healing roll you are given. This blood curse also extends to the other creature you drained.