Quote Originally Posted by Spuuky View Post
Chained Undead Giant is literally the hardest boss in the game I'm pretty sure
It sure felt that way to me

And yeah, BSB is there to basically force you to get used to quick dodges and quick recovery. And as Wolf says, once you're confident enough, it's super susceptible to gun repostes. It's one of the more erratic bosses. Also the poison is meant to scare you, if you stay up it's arse and manage to keep the aggression up, you get a significantly lower poison build-up than if you're just running from it and getting attacked; as there seems to be more/quicker poison build-up in front of it than behind it, and WAY more built-up from getting hit by it (which makes sense)