Yep, you can always hop back to Normal difficulty to go after the treasure. Just select Normal difficulty and enter the game, you'll emerge at the last rebirth fountain in the Palace. Then just slap down a teleport, choose the Plains of Judgement portal and then run/fight your way back down to the treasure room and pop the stones in place. Voila, instant treasure trove! After you've stored/sold the loot, come out of the game, select Epic and continue on your merry way.
Barmanu is the worst for me. I can deal with Cyclopses, but he sneakily hits me with meteors even when he's out of view. NOT FAIR!
