Uber Shaper is one of my favorite bosses in PoE. Even the invulnerability phase is well designed and can be mitigated with a couple of flasks, or just good movement.

PoB snapshot of the character in the video: https://pobb.in/nh1amqHAu_fk

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

Music: Eximinds - Sonata