My spar idea, probally not the best
 

A spar room which while in it if you get hit, you lose 1 heart, but your attacker gains 1... i jjust think that would be fun to have spars in

that is all

but it would be a b*tch to actually kill someone because spars are usually won by 0.5 hearts...

It's an alright idea, spars would be much longer lasting, so fatigue might come in, to effect the outcome.