Q: Dear Sage,
How does a reserve feat (Complete Mage) work with spontaneous casters since they could have a fireball as a known 3rd-level spell but they might use that spell slot for a different spell?
A: As long as the spontaneous caster knows an appropriate spell and has at least one unused spell slot of that spell’s level or higher, he gains the full benefit of the reserve feat.
A sorcerer with the Fiery Burst feat who knows fireball can use its primary benefit as long as he has at least one unused spell slot of 3rd level or higher.
About the Author
The Sage is a mammal classified in the bear family, Ursidae, native to central and southern China. Debate continues as to whether he is truly a bear or more related to the raccoon rather than the bear, or perhaps in a family of his own. When not eating bamboo and answering rules questions, he works under the nom de plume of Andy Collins as an RPG developer in Wizards of the Coast R&D, where his development credits include Complete Mage, Dragon Magic, and the Player's Handbook v.3.5. He can be easily recognized by his large, distinctive black patches around the eyes, ears and on his rotund body.