[quote=Raijinslayer]
I feel that your Master character wouldn't intentionally summon a Servant like Nidhogg, so I'm thinking we have her trying to summon the Eagle with a piece of Yggdrasil that survived Ragnorok. However, it was a root, not a branch, so it summons Nidhogg instead.
[/quote]

I like that idea. Let's discuss the details in PM. :D