I have to object to the notion of Nidhogg being a primal. Primals typically require prayers, crystals, and some other possible power. Nidhogg has no prayers or crystals. Not to mention that Nidhogg simply existing isn't draining aether. Dragons are a complicated bunch.

Also, please show me where you got the idea of Nidhogg possibly consorting with the Ascians because I really am not seeing it beyond a "really ticked off dragon".