Might want to try mixing up your team a bit. I did Water Totem with my Arena Rainbow Team accidentally and only had mild issues (just clicking through shit as I work like normal lol). That team doesnt have a Healer at all, for example. It made me pay attention to the fight, and like Thengel, they were all fully upgraded four star - but at no point did I feel like I was fucked. Maybe level up your BB's a bit more? Some BB upgrades lower the amount of crystals needed and make fights tremendously easier. Ice Keep with a 23 Crystal BB makes every other fight trivial. Use your Heal BB the round that the defense BB will be up and it just makes most fights a micromanagement of BB's. (I love my water team if you cant tell)I did water also but never would have survived without the Elimo friend healer. 3x AEs just suck. Going to wait for STA and try Fire if another healer friend is up. Would like to also do Thunder if regen permits. Maybe get lucky and have a light totem invade.