Adam Blade 
Ravira, Ruler of the Underworld [EPUB ebook] 

A new Beast has risen from the Underworld! Ravira reeks of death and commands a pack of fearsome hounds. Tom must defeat Ravira before Taladon succumbs to the hounds’ deadly bite, and is enslaved forever…Beast Quest Early Readers, adapted from the original bestselling Beast Quest Specials, are perfect for children learning to read and for families to enjoy reading together. The text is vetted by a literacy expert and there are bright new full-colour illustrations throughout.