Avada Kedavra

Accompanied by a terrible flash of green light, "the killing curse" causes instantaneous death. The target must make a Dexterity saving throw which, if failed, will instantly kill them. On a successful saving throw, the target takes 5d10 Necrotic Damage. There is no known counter-curse that can protect the victim from dying, except for a loving sacrifice. If someone does this, then your original target becomes immune to this curse, and any other damage you wish to do to them will be cut in half.

Be wary, your character's Alignment becomes Evil if you attempt to cast this Spell.