Quote Originally Posted by Kallera View Post
The personal wrinkle lies in HOW to "kill Nidhogg".
Easy, we already killed his body, now we need to destroy his eyes.

Midguardsormr makes the basis for this idea since, despite being killed decades ago, that his spirit remained and he has since constructed a new body.

Ratatoskr was bith slayn AND had her eyes destroyed (possibly litterally eaten too) so she's perma dead.

With his eyes removed Nidhogg's body was on the brink of death until Hrasvelgr loaned him one of his eyes.

This suggests that the eyes are the key to their existence and that as long as their eyes exist so does their spirit. Which could allow them to potentially form a new body (as Midguardsormr did) or possibly possess one like Nidhogg did.