Im with 3 grandmasters with experimental weapons 73 ar and i cant kill the fire candler either its kind of crazy how hard it is for the quest mission.
Also using the machine device at the top did nothing for me either.
I think its broken. I resorted to 3 plat bars.
Went to try Infinito for the first time and was surprised after clearing the 5 floors no accessories dropped like on Steam version, went to the vendors and saw they are pretty hard to get. Not sure if they drop at all from bosses higher up?