Boss room damage gates and enemy spawns
90%: 2 arc knights, 1 on left and 1 on right
80% 2 arc knights, 1 on left and 1 on right
67%: 2 solar wizards
50%: 2 arc knights
33%: 2 unstoppable ogres, 1 on left and 1 on right
20%: 2 more knights (burn boss to skip)