NOTE: Keep in mind that you have to have the right requirements to enter his lair (see article Keep out signs for what they are).
Plumpox is a troll who wanted to become Dizzywood's famous scientist. However, while at university, he created a giant monster which destroyed half the school, and he was expelled. He vowed revenge against the school, as well as small animals (reason unknown.)
He is responsible for the belch factories, the robots which cut down Wildwood Glen, Withering's flying fortress, and ichor.