Good game, but there's one boss called "Eros Wyvern." No matter what you do, it will heal to max health in just about six attacks. It has three health bars, resistance to all types of damage, and can use its lifesteal while you're downed, has absurd AOE for its lifesteal, and has resistance to all types of damage. Not to mention, all around him there's a type of enemy that has a chance to spawn with a healing variant. If you kill one of these enemies, another will spawn instantly to about under thirty seconds. Completely unfair, tanky, and unfun boss. It really ruined my late-game completionist experience.