As it happens, an evil dude named Chaos has plans to take over the Skylands. To that end, Chaos engineers a series of machines called the ‘evilizers’ (yes, evilizers, not making this up), which have the propensity to morph normal creatures into evil versions thereof. His plan is to evilize just one of the four great Elemental spirits who control the magic of the Skylands so he can corrupt a volcano which erupts once every umpteen years and fill the entirety of the Skylands with evil.
Source: wiktionary