Spoilers for the spiritseeking scrolls event!
Buffer image of double Ororon (I am very easy to amuse)
Okay so the most recent part of the event’s story talked a lot about the Mare Jivari…
As well as the location -
Remember the Specially Shaped Saurian event that came out before Natlan and teased a lot of Natlan details? I think that’s what Hoyo is doing here. My guess is the Mare Jivari will be an upcoming region within the next few updates - I think 5.3 is going to be Lantern Rite focused and 5.4 will add the Collective of Plenty, so I could see Mare Jivari either being the second 5.4 location or being added in 5.5. This is just my best guess though!
Another theory I have is that they’ll add a related character when they release the Mare Jivari. A lot of people have theorized that Ifa will be a playable character so maybe him?
Given Citlali’s description it will probably have a lot of environmental hazards (fun) + the “ominous creature the size of a mountain” sounds a lot like a boss, possibly a weekly one