Gnarly Tree Rex is a blue variant of the giant, Tree Rex. Long ago before the Giants protected Skylands, Tree Rex was a majestic tree living peacefully in the ancient woods. But this tranquil peace came to an end when the Arkeyans built a nearby factory to produce war machines. After years of his soil being poisoned by the magic and tech waste from the factory, he mutated into who he is now - a powerful Giant who will crush anything that threatens the natural order of things.