Diablo Game Questions Just started S8 on Torment I, and encountered a unique enemy with a very specialized looking nameplate. Can someone explain what that was?

I have owned the game since it released, but honestly rarely ever played it because I was a hardcore D2 fan and hated (and still kinda do) the design choices.

After jumping in and trying again (and realizing I can play on a high difficulty through the whole game), I ran across a unique enemy which I have never seen before (might have been Fields of Misery). It had a specialized nameplate (gold, colored, designed like a ribbon almost) and was probably harder than any boss I have actually encountered in the game at any difficulty.

Is that a rare spawn, or just a special type of Super Unique monster?