If you want to fight each other consensually in the PvE environment, dueling is your best choice. You will gain much fun from dueling others, its a contest of skills, a test of abilities and tactics in PvP combat. Select an opponent. Click on the players portrait and select the Duel option. A battle flag will drop from the sky, the person you challenged must buy aion gold, and otherwise you cannot able to attack him. There is a countdown before a duel start. As the characters name turn red, the player is now hostile. A sound will also play when a duel get started.
If you win, the system announces the result to the zone, therefore you get glory. You will not earn XP or anything to loot, what you really get is the satisfaction of knowing that you were able to defeat another player and possibly gain some experience at fighting other players that you will be able to use in the various forms of PvP combat. But sometimes, players wager bets on duels, so maybe you can earn some aion gold.