Beidou was a pirate. She got a map for a treasure in jueyun karst. She went there of course to go into the cave. Once she did she and her comrades stumbled about a being floating in the very back of the cave with dark green hair, seemingly slumbering while looking like a scarecrow. This is the „slumbering adeptus“ Adeptus Xiao. One move and if he wakes up? Then it’s over as he holds a dangerous grudge against humans and if he sees one? Then they’re one head shorter