nittanytbone said:The feats usually also give a +1 bonus to a certain spell save (For example, +1 to saves vs. fire).
Kurotowa said:Not quite. They usually give you +1 caster level to the same spell type as the one that powers it. So Fiery Burst grants +1 CL to fire spells, Sickening Grasp grants +1 CL to necromancy spells, and so on.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.