Halpi’s Rift has so much going on that pointing to doesn’t norrow it down much.
The Twilight Kin lore in Clash 2024 mentions Ophidia with some detail (see here), Tetsumo Shogunate and the Xirkalli Empire.
Empire implies an army made up of a variety of cultures, which translates to multille species in a Fantasy world.
Considering the Armada books on the picture and the ships in the IV teaser, the Xirkalli empire sailing jn from the East seems like the most likely.
There have also been hints oc Morgoth returning and the power hidden in Chill. The last campaign indicated that the shard or tge Feniluan Mirror are at Chill. The are several written scenes of Talannar speaking to someone female that he’s protecting and getting advice from.
My wild speculation would be that it’s either: Winter’s shining aspect, Elianthora or Eoswain.