"Key" to Azys Lla?

[Cilia]

My idea i tried to propose was that the vanu were created with one purpose, keeping bismarck sustained.

If I recall correctly, the Vanu Vanu were quite upset that Bismarck had recently eaten the key to Azys Lla. They treated its protection as a sacred duty, and were more than willing to let us bring down the beast to retrieve it.

Combined with Vanu Vanu creation myth, this suggested to me that Bismarck was based on a special transport vessel that brought the race to the Sea of Clouds, where they were to keep the Key safeguarded until the end of the world / until the Allagans had need of it again. I don't think the Allagans ever counted on their slave races developing the ability to summon primals, much less encouraged it.