You mean argus?
Argus totally looks like the aesthetic of oribos and the blue scythe he used perfectly matches the eternal traveler’s transmog set.
He was originally datamined as “death titan” but then they changed it (probably because it was a big spoiler) and when we started Legion and when Ysera died in Legion, the Arbiter was working just fine.
Then we got the cutscene with the big red soul hurtling down into Oribos and smashing into the Arbiter (Argus’ soul or something like it right after we kill him in Antorus) and the Arbiter immediately stops working.
I’m 100% convinced Argus was either made to replace Zovaal with the Arbiter or he was left there to guard Zovaal and keep the Arbiter safe and watch over the shadowlands.