Hero Lineup : Assassin King, Rocket Lady June, Talisa, Chichi and Amelia
2 -attack heroes due to the quite high attack plus critical of the bomber bats
2 healers or 1 decent AOE healer that can keep up in healing all heroes
This is not the only lineup that works in this dungeon.
I've seen others with this lineup : Wicked Jagar, Spearman Lak, Talisa, Gonzales and Prince Frog.
Feel free to add anything that can help.