'Mystery Mage' Joey Terrain, a secluded expert who lived in the secondary dimension world, was a person from the same era as the foul-mouthed 'Elf King' Dylan.
There was, however, no such person within the galactic history. He had avoided the universe for a long time without leaving any record. The first time he appeared before the universe in Han Xiao's previous life was during the World Tree invasion.
