August 2025 update: This method still works.

The boss will not spawn adds if you are only running ranger / wizard characters. This means no melee units at all on your team will make this stage a thousand times easier.
This is my current setup, which I used to clear floor 55. I’m using triple offensive pets for more damage.
Lisa
Lisa is using
Lua
Lua ’s card since
NEO Bedivere
NEO Bedivere benefits more from using hers.