A secret technique of the Burning Valley that uses flames to increase the power of the user temporarily. It was created by Xiao Xuan for them. Xiao Yan discovers an inconspicuous slate containing the first part of it. He later obtains a more "complete" version after befriending the Burning Valley which has 3 parts.
The stronger the flames the user uses, the stronger the effect.
After going to the Gu Realm and visiting his ancestor's tomb, he meets Xiao Xuan who bestows the complete version to him. This version has 9 parts and when completed displays the Xiao Clan's Clan Mark on his forehead.