GAUNTLET!!!
narrow hallways! rolling boulders! dead end hiding spots!
giant checkerboard of explosive grates!
windy plains! support walls! spikes at the other side!
...ok, enough exclamation points...
ok, so, players would be in groups as normal, but fighting their way thru a gauntlet. have a narrow hall with occasional outlets on the sides to avoid giant rolling rocks that take down half their health. an open feild with a few walls scattered, and massive gusts of wind that blow players towards a wall of spikes at one side that kill on impact. a massive checkerboard of nothing but explosive grates with alternating explosion times.
all while fighting trash mobs that drop a good amount of gold. to get to a boss room with every boss in the game, one by one.