you can sometimes be attacked by players of the opposing faction without warning. To promote the idea of epic adventuring with friends, World of Warcraft also introduces a concept called the instance dungeon . Instance dungeons are dungeons in the world that spawn specifically for each group of adventurers that enter them. Each time a group enters such an instance, a unique version of it spawns for that group only. This means no other players can play in that instance and bother the group,