You really should use warlock for that Medusa boss. He has armor breaks to stop the armor explosion and the bleeds to do damage and the healing to stop her buffs.If that doesn't work you should be using venompool to ear her buffs as well. Capiw also has bleed on his SP1 as well as perfect parry so you can rank blocked hits You also have AA who can still bleed and you can get to the SP3 to do a neuro. She takes 200% bleed damage so it's not bad.