History
Xue Xi (Blood Seal) was an Immortal Emperor during the Ancient Ming Era.[1] He was groomed by the Mysterious Bamboo Mountain and Dark Crow,[2] although it is not known whether he was one of the Mysterious Bamboo Mountain's Emperors.
Xue Xi was Dark Crow's friend and half deciple[3] and helped Alchemy God to create special method to help Dark Crow quickly understand the truths of any techniques he studied in the past the moment he saw them again.[4]
Dark Crow also taught him the Revolving Crescent Sun Merit Law, in the hope that Xue Xi would be able to perfect it. Unfortunately, Xue Xi failed.[5]