Hey any Torchlight 2 players, i found a nice little bug. When you're in the desert part and you have the questline from the Djinn dude, you take a portal to a dungeon in which you have to stay inside a circle of light as you move through the level. You wind up fighting a bunch of monsters and getting tons of loot, including a couple giant chests, unique items, and a secret spot. After you're done, you can re-enter the zone and do the whole thing over again.
The zone is called the luminous arena or something. Also, when you reach the end of the follow-the-light part, wait around before walking into the portal and a lever will spawn, leading to a secret room with 2 more chests.
Have fun!