>>527993047
The Xianzhou is a fleet of eight Chinese ships born of a covenant between three long-lived species: Xianzhou natives, Foxians and Vidyadharas. The first of them were granted immortality by Yaoshi, the Aeon of Abundance, but soon discovered it wasn't a good deal because they become insane and go berserk after having lived too long ("mara-struck"). So they set about destroying other species blessed by Yaoshi, both those equally advanced as the Xianzhou and those who haven't even reached space.
They have both a mercantile and a military wing. What sets them apart from the army in Skirk's story is that they are never portrayed doing morally reprehensible things on-screen (Liyue Ichiban and so on); only in the lore can you find evidence of their depredations.
