A large group of us (including Kasia, Raiden, Lagger Stee, Simon, Muirious (sp?) and others) gathered to do maps in front of Brit Bank when we were approached by a Royal Alchemist (forgot the name, sorry) asking if we had ever heard of "Eye of Newt." We all admitted we did not, when she replied that of course we did not because Connor was hoarding it all. She bade us be prepared for a future time when she may need our help and left.
As we prepared to head out, we were attacked by a pair of yellowish-orange "Stars of Hades." They are very similar to Black Wisps and they hit, hard.
The ones in front of the Bank were defeated, and then when we popped our first 2 treasure chests, more of them appeared. They unfortunately killed 2 of our group in the Skara Farmlands and so the decision was made to return to Brit Bank.
If you are doing treasure chest maps of ANY level, be prepared to face these demons.