The Demon Awakens (3 of 3) [Dramatized Adaptation] by R.A. Salvatore

The Demon Dactyl's army is laying waste to the entire country and the only way to stop their organized takeover is to cut off the root of their army's vast power: Bestesbulzibar, the Dactyl, himself. Elbryan, Pony, the Mad Monk Avelyn and Bradwarden the centaur, reunited with the elven Juraviel and Tuntun, set out to do battle inside the demon's lair: Mount Aida.