Helmets! They don't usually do anything and when they do it seems excessive (1 point of AC comes to mind). I'm still fiddling with my own rules and I came up with this. Whenever a blow brings your character to EXACTLY 0 hp wearing a helmet effectively keeps your character at 1 hp. Your helmet saved your life, as they should do, and you get one last chance.
@gunnar I would put it on the player to remember. DM: 19, The goblin hits you. Player: Rolls % - 07, my helmet takes it.
@jburneko I figured it had to be something like that. Wouldn't work at my table I think.
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