Another bat player (who must be at least level 8) can repeatedly use Virulent Bite on you for a chance to give the Fevered Trismus disease which will change you into a bat after two in-game hours. During the Halloween event, one may also be bitten by an enemy bat's rage attack for Fevered Trismus. Finally, enemy bats on the lower levels of the [[Labyrinth]] dungeon or [[Gazluk Keep]] dungeons can inflict Fevered Trismus on players.