It was the king's son. Wyver's. Apparently the dragon was killed a long time ago, but he brought it back to life.

[ Mikazuki comes from a future full of backwater Martian towns and technology, his magic knowledge, including necromancy, isn't all that impressive. It's with a shrug-like gesture that he comes to a stop before the ship's incline steepens. ]

He got eaten, in the end.

[ His lack of remorse is pretty telling, as for what he thinks about it. ]