the 12!!!!! omg !!!!!!

[sidurgu-12]

And my speculation is:

This are the twelve Amaourotians, who surrendered themself to summon Hydaelyn. You can see them in the Amnesis Anyder cutscene:

Cheers

this is from a qa but

its been confirmed that since there were a lot fewer summoners compared to zodiark they had to be consumed entirely so like hydaelyn they cease to exist.