Primal Fire is a molten chunk of pure fire goodness. It is used in a wide range of high-end recipes. In addition it is also considered the most in demand, and thus, profitable primal for farming.
Primal Fire is made by combining 10 [Mote of Fire], which can be found off fire elementals or in Fel Iron deposits. A guide to finding these can be found here.
Primal fire can also be created through Alchemy with the Transmute: Primal Air to Fire and Transmute: Primal Mana to Fire recipes.
Primal Fire as an ingredient
Primal Fire is used in the following recipes: