The Pyromancer is an archetype for the Alchemist class and is one of eight traditions, including Metamoporhs, Poisoners, Artificers, Reanimators, Herbwardens, and more. You'll need the core class presented in the original article and this to play the pyromancer.
Bonus FormulaDespite their nom de guerre, pyromancers are experts in fireworks, explosives, and energy manipulation beyond simple fire. Sought after by royalty and warbands alike, both for their ability to entertain as destroy enemies en masse, the skills of a skilled pyromancer go for a high price and their names reach farther and wider than many wizards.
The majority of mixtures created by pyromancers take the form of bombs, rockets, explosive vials, and empowered ranged weapons and ammunition such as sling bullets and crossbows. Many pyromancers devise their mixtures in the form of primitive firearms and cannons.
As with other alchemical traditions, pyromancers can create simple mixtures outside of explosions. Skilled pyromancers not only create fireball-launching mortars and melf's acid arrow firing crossbows, but healing mixtures and defensive devices such as potions of expeditious retreat, automated field defenses (shield), and force field projectors (mage armor).