Prerequisites
Benefit
Choose a school of magic, or one alignment (good, evil, law, chaos), or one energy type (acid, cold, electricity, or fire) to which you already have applied the Spell Focus feat.
Add +1 to the Difficulty Class for all saving throws against spells that are from the school of magic or that possess the descriptor for the alignment or energy type you select. This bonus stacks with the bonus from Spell Focus.
Special
You can gain this feat multiple times. Its effects do not stack. Each time you take the feat, it applies to a new school of magic to which you already have applied the Spell Focus feat.