Guardian Overseer concept Picture

Listening to: Samurai Legend Mushashi: Temple of the Ancients
[link]

This is a quick idea I worked on, wondering as to who could work as a guardian for Xalis. This would be the prefered form that this Overseer usually takes. (who goes by the name 'Echidna' for the time being)
Even if she dosen't take on the role of guardian, I will more than likely still use her in the story.
The initial idea I have in my head is that she would be responsible for actually creating creatures/spirits for herself and others to summon. In a similar sense to Greek mythology, she would be regarded as the mother of summoning.
Meduse
Fallen
Guardian Overseer concept
Harpie
Master of Orthus