Man this game can be stressful. Thankfully I beat the first boss blind on my first try despite having no health potions. I had 8 focus potions on me already for its 2nd phase and had the forethought to destroy the mob spawners before doing anything else. The 3 explosives I had on me also helped. However, I imagine a lot of people died on their first attempt to it because man is it a steep hill from the dungeon floors. It had WAY too much health on top of the mob spam and I felt like it was a pure stroke of luck that I was somehow prepared with what I had.