12 players, one spawns with sword. 'Swordbearer' has as much health as a roaming super. 11 players who can't damage each other kill swordbearer, whoever deals final damage gains sword. Points scored by killing with sword, no supers, apart from swordbearer who gains a fist of havoc style ability after 5-7 kills.
Also, DestroyerofSouls' idea for heavy flamethrowers
Edit: sword one shots, super and right trigger have area of effect attacks with increasing size
Edit 2: six people a game, five killers one swordbearer
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Swordbearer must have unlimited Super-slam. Basically being Crota, everyone else lvl28.