I really don't even know what to say. This boss was so difficult, I'm so happy I finally did it. So many times did I consider cheesing the boss but I stayed strong to the end. That clutch is unlike anything I've seen in a while.
For those who think this is easy, try it yourself before saying that... TRUST ME, IT'S NOT!
Timestamps:
00:00 - Phase 1
02:43 - Phase 2
Music used was Brutal, Stained Calamity by DM Dokuro, for the Terraria Calamity Mod. Of course, I only used the epiphany part of the track.