Speculations here but anyone wonder if the Vanu Vanu actually followed Hreasvelgr ( he looks like Bismark in a way, big, white with feather ) and then were separated from them between the war of the gods the mog myth talk about that was actually a war between dragons ( hence why 2 holy dragons are missing, they died in that war ), Vanu Vanu and mog were then separated from the dragons and from each others ( Vanu Vanu knows about mogs while they never see any ), myth then turned the dragons into gods. Mogs having only work again for the dragons after the start of the dragonsong war or the death of Shiva as a pact with Hreasvelgr.
Some millenia after that war of the gods, the allagan reached the sea of cloud and made the Vanu Vanu their slave and created the mirror knights and ixalions from them but the Vanu Vanu were freed thanks to the revolutions and the fall of the empire and kept the key to Azys Lla since then and kept the memory that no one should open the gate to Azys Lla ever again.
This is obviously all speculations.
