

Thousand Dragon was the gatekeeper of the Underworld Kingdom ruled by Gaia. He had 1000 servants, who could transform into a large wolf's head as battle formation. With this formation, he awaited Gin and Reima, who thought the wolf head was a rock and almost fell into the trap. Noroi jumped in the mouth of the wolf head but was spat out and died for the injuries, revealing the trap. The wolf head was blown away by Retsuga's hurricane but Thousand Dragon did not and it dragged Reima into the Underworld. Reima hitted him and Thousand Dragon was not seen again.
Even if Reima didn't see his dying, it's stated that Thousand Dragon was burned alive in the lava.