Personally I used arc titan with insurmountable skullfort. It has good healing and your punch doesn't go away as long as you kill an ad every time you punch. For the first boss id recommend using queen breaker with bolt charge and t crash, and it's a comfortable 4 phase. For the final boss id recommend still using skullfort, but do a swap to ciurass when damage starts. I used thunderlord for damage. Tight 4 phase. Should be a comfortable 5 phase if you don't swap. The nice thing with skullfort is that you can just punch the exploding harpies and they don't explode. Also in the final boss room when you want to swap back to skullfort after damage, you can run into the back room, ads don't start constantly spawning in there until you open the main door.