Why does Ysayle want to protect Nidhogg? (spoilers)

[Dalvy]

Speaking of the final two... Has it been said which brood Aiatar came from?

Hmm, with two dead, one insaine, and two more sucumed to grief, what are the final two missing Celestial Dragons like?

It's not beyond immagening in my book that they could be the Auri Dawn Father and Dusk Mother, but what of their mental state?

It seems the Dragons big braging point, their near immortality, is actually their biggest flaw seeing as how 3 of the five living Celestial Dragon have succumed to suvere mental disorders while Midguardsormr him self has decended into a near apathetic state even in regards to his own children.

He cares enough to worry for his son's & daughter's mental wellbeing, but strangely not a word about Hraesvelgr. But yes, Midgardsormr is pretty apathetic. I was under the impression that he deemed Nidhogg a lost cause.