I’m just god awful at this trial. First attempt went w/ this team and the items pictured
That was a mistake and I died on the final (boss) stage. So the next time I removed Cyprian and Jack O’Hare and put in Triton and Sonya. Removed the mana potions and took time stops. I made it through but used all of the time stops. I’m doing something wrong, I think 
Edited to add: I did mess up and failed to charge heroes before final stage. If I had maybe I could have used fewer time stops? Not sure