Epic Spell Focus
( Complete Arcane, p. 192)[Epic]
Choose a school of magic, such as illusion. Your spells of that school are far more potent than normal.
Prerequisite
ability to cast at least one 9th-level spell of the selected school, Greater Spell Focus in the selected school,
Benefit
Add +1 to the DC of all saving throws against spells from the school of magic you select. This bonus stacks with the bonuses from Spell Focus and Greater Spell Focus.
Special
You can gain this feat multiple times but its effects do not stack. Each time you take the feat, it applies to a different school of magic.