Originally Posted by Sir_Chivalry
Priest of Phlegethos: A disciple of Belial/Fierna who prepares spells can convert any spell prepared into a [fire] spell of the same level when casting. A spontaneous caster gains a +2 to caster level when casting fire spells.
Wait, every spell you cast, you cast at +2 caster level? That's a nice ability, not exactly too powerful, but seems odd coming from a prestige class.