Dr Doom
I've kind of struggled with this BS boss, he's a Tank!! Takes less damage, crit resistance etc.
Normally have no issues with UC bosses.
Have found a hidden counter. I one shoted him with my 6* Domino.
constant SP2s and the critical bleed just shreads him.
He lost around 20-25% HP per SP2. I got lucky!and he got unlucky!
Just to share as no one really mentioned Domino