Archibald Mangum is, according to Errol Fisk (Christopher Vogel), a Viviblix, but this was disproved by Stan who said he wasn't any kind of Blix. Archibald owns a mortuary in the same town that Kendra and Seth Sorenson lived in. He is supposedly a good friend of Stan Sorenson.
In Rise of the Evening Star, Errol made Seth go inside of the mortuary to retrieve a frog statue. It was later discovered that the statue was in reality the demon Olloch the Glutton. While trying to take the statue, Seth was interrupted by an aggressive dog but he manages to befriend it through giving it a dog biscuit and after that succesfully stole the statue.
- Rise of the Evening Star (Fablehaven #2)