Dungeons are accessible by players via purple portals. A player can enter a dungeon on his/her own or as a group. While in a group, however, you do not have to enter the dungeon together.
Loot at the end of the dungeon is given out in the format of an auction. Players may choose to place their biddings before the timer (unsure of exact time) runs out or choose to pass, and the player with the highest bidding will obtain the item.