#Bommel can be a major bum especially as you move up the Hard part of the Tower!
Champions used and why I believe they worked. #bommel doesn't like it when you try to give him debuffs so he will repay you with bombs. It seems the best way to combat this is to avoid placing too many debuffs, keep your team healed up, and make sure you have a couple of good revivers.
#duchesslilitu not only does she revive, heal, she increases speed on the team,she also reduces damage they receive from aoe.
#godseeker, #doompriest are both healers and #vogoth heals everyone each time he gets attacked.
I use Godseeker to revive Dutchess if she needs to be and then Dutchess to revive everyone else.
Who else have you used?