Needs review
Source: Sandstorm

Description: Your fire magic is bolstered, further scorching your enemies.

Prerequisites:

A fiery spell deals an extra 1 point of fire damage for each die of damage the spell deals. This feat can be applied only to spells with the fi re descriptor. For example, if a 9th-level wizard with this feat casts a fiery fireball, the fireball deals 9d6+9 points of damage. A fiery spell uses up a spell slot one level higher than the spell's actual level.