Yea i was referring to the ending of the quest-line in Revendreth.
When i played i had not actually realized the change by Oribos. My Son pointed it out as he was looking while i was checking the beta out lol. At first i didn't realize it but yea it changes to a more reddish color. Also gives the impression like it grew in size and like it's about to overtake Oribos. One of the more visually stunning parts of Shadowlands thus far.
Yea there's a lot back story that they are slowly peeling away. There seems to be a great history especially with Primus. Who seems to have suspected the plot long before Zovaal decided to actually put into place. Btw Runecarver or w/e his name is is probably Primus. And his memory was wiped or diminished by the Jailer to try to keep him contained and avoid any sort of meddling by him.
I think what he forged for the Jailer was the helm/frostmourne etc.... but we'll see if that pans out and with the confirmation of his identity being Primus or not.