Yes it is. You use claudia to block (gank) the boss and make use of her skill (she does true damage) to kill it. Iris and fedora and alissa should be enough heal to support her (i have the exact same healer setup and i did it - but if u need more heal , u can use shiho as a substitute) . You could level her a bit more if u want , but at 56 , claudia should be enough to tank it. Just follow the guide video. You shouldn't have that many problems with it. It's all there is to it : block and heal. As long as you have a good blocker and enough heal, the support units don't really matter for that map. Just gank the goblin mages to stop them from nuking your claudia while she tanks the boss with some weak/cheap duelists , and u should be fine