Tom’s battle to prove himself the true Master of the Beasts has taken him to the jungle wilds and the tropical ocean. Now, in their final face-off, he and Amelia must travel deep into the underground mines. Uh-oh: are you scared of the dark? But it’s not just the dark you need to be afraid of. Tom has battled some tough Beasts before. But none like this: a warrior made from indestructible diamond! Karixa is seriously hard. And to make matters worse, Tom knows that his rival Amelia can’t be trusted…