The Chest of Eternal Wealth is buggy. I opened it successfully (!), and found moderate loot (an unidentified wand and armor) .. and the chest sat there, looking like an open chest. So I had Madora take it (my main characters are not strong enough) and got the message I expected to get when I first tried to open it .. but it still showed up in Madora's inventory! I then rift-ported to the End of Time, thinking it would be a cool trophy chest and dropped it on the floor, whereupon the game crashed to desktop.