There is almost no challange at all during exploration. World bosses could be done solo, even in Craglorn. I think, considering we can have very high CP level, one new group zone with new awsome trials and group delves, crypts e.t.c. but little harder than Craglorn would be cool. I mean we all know how awsome are Craglorn trials. That zone is the heart of the game. We don't have trial finder so we spend a lot of time out there looking for groups or grinding exp. Some people like challange and there is nothing wrong to have more places like this where we can have some challange playing solo in small group. I think it's time for such DLC.