Revelations from Patch 5.2

[Vyrerus]

Qitari bloodsworn finale.

The true form of the great serpent. Presumably meant to be based on the Archaeovis from FF5, since that was found in the Ronka Ruins in that game.

That is correct. That is also the model they used for Alte Roite, which in FF5 was a palette swap/same sprite as Archaeoaevis from the Floating City of Ronka.