Thank you all so much for your feedback and advice!
You were right jazz154 and Aidoru , I tried two runs with a new set up: Mordred, Ramiel, Baal, Shiva and Sol. Using one sr thunder weapon with atk level 5 (would be nice to have another thunder weapon with atk for things going more smooth, my other one is a ssr ballista with HP from last event) , some water and light weapons I had tuned it up to skill level 5. First run got lucky on potions and was fine, the other run, no potions and still managed to do it. ^^