This is a skill intended for assassins, that is dependent on the victim and the character's level, to give an absolute maximum chance of 50% of instantly killing a foe. Feel free to tweak it at your leisure. I changed the damage type so it works independently of immunities, and it deals damage independently of the void one_hit function, or void multi_hit. It attempts a backstab if the dispatch fails, and a succesful dispatch against a superior enemy yields a small bonus.