Borrum is mentioned when Vully and Sirsir talk about Iris's size. Sirsir calls her "little one", to which Vully replies by asking him if he'd already seen "Borrum's little one" since she deserves to be called that (unlike Iris). This means that Borrum's daughter is either small for a Sky Elmin or still rather young, or both.
- Borrum is a wind god of Celtic mythology.
- His tribe is never stated in the book, but can be deduced from his namesake.