In actuality, the gargoyles are the hardest boss I've faced yet but I feel like the Moonlight Butterfly was supposed to be the hardest boss I had yet to face. I managed to find a sort of hidden summon for an NPC before the boss that was able to just completely obliterate the boss while I kept back with my shield. I say I feel like it was supposed to be difficult because the boss did manage to land one attack on me with my shield up. It managed to drain all of my endurance and knock off half of my health....I was in human form....in other words had I been an undead I would have died then and there. Thank you Beatrice. God bless you.