Another bad design: invulnerable boss phase that's much harder than the rest of the fight. And you can completely skip it by logging out (like everybody in HC) or just dying and waiting for it to be over. Doing it "properly" requires much better gear. It's like the designer meant for you to log out and cheese it.

PoB snapshot of the character in the video: https://pobb.in/ZY5GPrQ9g0aA

Link to the build: https://www.pathofexile.com/forum/view-thread/3294484

Music: Splinta - Shock Therapy (Bobby Neon Remix)