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According to what I learned from what he had talked before, Zack had once lived for over a year in the wilderness. Of course, he lived within the vast dome made of magic that protected the village of the Amazon tribe. However, he lived outside of this place, in the surrounding vegetation where animals crawled around.
This massive dome covered more than a kilometer of land, so there was plenty of wild areas to explore and go around without even heading outside the barrier.
He had explored a fair amount of all of this and was often our guide in such places because he learned everything almost photographically inside his mind.
Apparently, he had escaped the village after the tragedy with his parents, who had perished in a monster tide. He was a little toddler and made a rash decision, but somehow, he survived outside.