The Immortal Writ came from the high heaven.
Immortal Emperor Jiao Heng owed a debt to the Gu Clan, so he bestowed the nine Immortal Writs to them. However, the Clan misunderstood Immortal Writ's origin and believed that they were Jiao Heng's Emperor's Possessions and their power came from the Emperor. Because of this misunderstanding, the Gu Clan used six Writs during Jiao Heng's reign, but the last three were preserved as symbols of the Clan's glorious past.
The Immortal Writ grant wishes written on it.