- “'Tis—'tis naught but a child! Why—why, my own son Bergil can be no older!”
- ―Samuel Muin, about Vespertilio
Bergil Muin was a black squirrel of the Hazel Realm, the son of Samuel Muin who served as a guard there. While traveling in Princess Ysabelle's entourage to Greenreach, Samuel finds and captures Vespertilio but cannot kill the bat when he realises he is a child no older than his own son. Bergil was murdered when the bat army attacked Coll Regalis.