Quote Originally Posted by Ramesses View Post
Perhaps that's how Elder primals evolve... remember how after Midgardsormr takes down the flagship Agrius, it seems like he splits off into several primals?
This has been explained a little.

First and foremost, Midgarsormr is a king or guardian of wyrms/dragons, not a primal. Best guess is they keep growing with age, and it also represents their stature in dragonkin.

ANYWAYS, in the fight over silvertear falls, the great wyrm causes the ship to crash... the ceruleum which fuels the ship ignited, and killed Midgarsormr and anything nearby, but the explosion was concentrated over an ancient seal noone knew about at the center of the lake. When this seal was broken, the primals were set free.

Most likely this holds some relation to the crystal tower, and the tomb of Xandes I is near both of these elements of Mor Dhona. HOW close, or any overlap, is still unknown.