Xiao is an adeptus, the reincarnation of Lord Morax, the God of Geo, also known as Rex Lapis. Morax had choen to reincarnate so he could see his love, Guizhong, Goddess of Dust and Salt, and be with her again...

He senses Guizhong in you, but he doesn't know, he isn't sure... He can't reveal this secret until he is sure.