I went through the door in the sand dune Mawsworn area of Zereth Mortis and there is a large room and 5 smaller rooms surround it.
This location is not used in any of the chapter quests or side quests, there are no schematics for the synthesis forges, and yet the Mawsworn are trying to break inside. When you try to enter you get a debuff and lose 10% of your health per second.
Could this be a location for a potential mini raid in 9.2.5? Maybe a short quest line? Was it abandoned?
What do you think? https://i.imgur.com/bB72xkx.png
It’s part of the next chapter, Starting Over.
I won’t spoil what exactly but you can easily google it if you like.
Sorry it isn’t quite as mysterious as you probably wanted. 
It’s where the new Arbiter will be created
Mortal enemies of the Bloods of the Eternals.
You know those parts in a disney ride that aren’t finished yet or they just give the illusion something is there?
That’s what that is. At least for another week
Don’t tell the kidnapped children of its a small world that 
Now now. Those are just the RUDE children. They don’t count
