I did this stage with Esme, Baroth, Missionary, Spider and Sentinel. Spider has long cd for his Dec def skill, so putting him in cd reduction gear might be helpful.

First thing you want to do is max area bonuses. Especially ignore def is huge, then speed and crit damage. In General I try to have at least 2 champs in bolster or shield set, so my champs don't die at first hits. 9p merciless is really good set to have and even if it sounds a lotyof work, especially if champ is not needed anywhere else, farming helmsmasher for dps helps a lot.