Kill Your Killer
A simple variant of Free For All. When you're killed, sit down and watch your killer. When they're killed, you're fully alive again. The game can only end when one person sucessfully kills everyone else on the field without being killed themselves.
As a variant which speeds things up a bit, any time you kill someone you gain all your limbs (shield, armor) back. Without this, the game pretty much never ends if there are a large number of fighters and/or more than two or three of them are highly skilled.
Also known as a Vampire Battle or Highlander Battle