To put it lightly I am getting murdered on this level. I am level 17. All my heroes are maxed. I've tried every combination and I still can't beat it. Someone suggested I use Yasmin Bloom, Stone Fist and Willow Swift . Even with rejuvenation and revives. I can't get enough DPS in before the boss is down. I don't know what else to do. How much further do I need to farm before I can put a serious hurt on that boss? Do I keep PVP'ing until new hero comes in as a daily reward? Seriously, please help me.
Champion: Dhaegon Stonecrusher6* 
Hero Wishlist: Lupina 6* (103/150), Augustus the Paladin 6* (107/150), Icebloom (224/100 to unlock), Thalia 10* Hero Cards When I'm fresh out of stamina sometimes I get a little snippy...Apologies.