So,

I have some speculation based on some stuff I’ve heard from the media tour.

[Spoilers for some lore in Othard]

Information is coming from here:

At about 1:35 in he talks about a new tribe of Raen Au Ra who live under the water. They worship and are guarded by the Ruby Princess.

Now, if you’ve seen any dungeon footage you’ll know what the Ruby Princess looks like. I haven’t found any footage explicitly of the dungeon to post it  but Mr.Happy’s overview video does show him fighting her at about 21min in.

As you can see; She’s decidedly not human. I think she may be a primal of the water dwelling Raen. I think our primals post-Lakshmi/Susano will be summoned by the Raen and the Xaela of Yan Xia.

Because I can’t really see what scenario would have us going through the tower/temple of a princess being attacked by the guards and ultimately fighting their princess that isn’t trying to quell a primal.

There is also a part in the Revolutions music video where it shows Xaela women with a jar of something throwing it down and causing some form of magic to happen. To me it looked a lot  like a summoning of something possibly there primal?

Not the strongest speculation but it’d be cool to see it happen.