Trema the Slug Monster (Beast Quest)

Orchard Books (Oct 1, 2009)
ISBN: 1408304414 / 9781408304419
Fearsome Trema lurks in the bowels of the earth, only emerging to feast on his prey. Tom has no choice but to brave the underworld if he is to defeat the Beast and lift the curse an evil wizard has placed on Freya, the Mistress of the Beasts. But a terrible shock is waiting for him above ground! ...