A duel is a voluntary one-versus-one fight between individuals, with the exception of kensei players, that can be requested through the game menu. During the duel, the involved players cannot damage anyone other than his or her opponent or be dealt damage by others. A duel automatically ends when a player reaches the 20% health threshold and it is impossible for a player to go below that value, even with critical hits. Due to the possibility for player-killers to attack weakened duelists following a duel's conclusion, duels commonly take place in a town.