Feeling tough? Challenge a friend or foe to a duel outside of a Player vs. Player area and prove to all spectators you are the superior one!
Right click a player and select Duel to send them a request. If accepted, the Duel Setup window will show a variety of rules which can be selected, and also allow you bet with items and zulie. Winner takes all.
When a Duel starts, the rules are shown on the left side of the screen. The area in which you can Duel is shown as a large red circle.