Hello,
i've been playing poe for 11 years doesn't mean i'm any good at it, even more i haven't been bossing for the two last league and got carry and those here were just done for the progression i died once on shaper if i remember well. As always easier boss was Sirus.
here's the mapping: https://www.youtube.com/watch?v=bTYVqynLfP8
here's the pob: https://pastebin.com/ztDSZq9f
I think putting "use when hit rare or unique monster" on your flask would be smarter.
It cost me 20 divines to level up and gear this character.