Celestial Ice Flames were extremely cold blue flame with glacial Qi that Han Li discovered when he saw them in the Heavenvoid Cauldron for the first time. These flames were then condensed into the Celestial Ice Pearl by the Bone Sage. Han Li had to wait until Nascent Soul stage to began refining them at a slow pace.
The icy flames can turned beings into ice sculptures. They are dangerous to Nascent Soul cultivators.