Nevercold (Refined)

Nevercold, sometimes mistakenly referred to as nevercoal, is the charcoal left after wildfires in the First World. True to its name, nevercold remains warm to the touch. If you use nevercold to cast Fire Shield, the spell's duration increases to 5 minutes, the cold resistance you gain from it lasts 1 hour, and you're immune to minor and severe cold for 8 hours.

The catalyst affects 8th-rank or lower fire shield, and the immunity from minor and severe cold lasts 24 hours.