[Gambet]

Forest fires caused by flamethrowers would be interesting. Maybe a jungle level with a huge pond in the middle, and the pond is a 'healing pond'. Basically, it heals your hp SLOWLY the longer you're in there, and it cures all abnormal statuses that you may have (like poison). The catch is that you can still get hurt while in the pond, so it wouldnt be wise to camp in there when enemies are around. Oh, and maybe a function where you can get rid of fire (if you're on fire) unless you go inside the pond.