Updated Trials of Survival - Level 3, post v20 buff to the bosses. The video linked below jumps straight to the boss wave. This quest feels harder than before, but that could be it was always dicey to run a quest without a healer. I used all my healing pots and I can imagine that this quest will not always be beatable by a team of 4-star classic heroes.
I used 2 Grimms (1 maxed, 1 at 3-60), Scarlett, Gormek and Little John.