Wiktionary
pyromancer
n. 1 One that performs divination using fire. 2 One that has a magical ability to conjure or control fire.
WordNet
pyromancer
n. one who practices pyromancy
Usage examples of "pyromancer".
Once there, he applied for the position of Apprentice to the Master Pyromancer, a Fire Wizard, Flarman Flowerstalk.
In fact, this one was once my Apprentice, and is about to become a full Master Pyromancer, if he can pass the Examination!
Mym found the two Pyromancers hunched over a tiny flame screened by thick holly bushes.
Four master pyromancers conjured up beasts of living flame to tear at each other with flery claws whilst the serving men ladeled out bowls of blandissory, a mixture of beef broth and boiled wine sweetened with honey and dotted with blanched almonds and chunks of capon.