There is bugged Forgotten Lockbox in the tavern in the mists,
you can loot it infinity of times, getting 12k xp unrested and 10g+ every time
I keep getting errors (this is not a valid image) trying to upload screenshots to forum server directly so here are links to imgur:
https://i.imgur.com/sx4Wn.jpg
https://i.imgur.com/mG2aF.jpg