Arcane Thesis
( Player's Handbook II, p. 74)[General]
You have studied a single spell in-depth. Your expertise grants you formidable though narrowly focused arcane mastery.
Prerequisite
Knowledge (arcana) 9 ranks, ability to cast arcane spells,
Benefit
Choose one arcane spell that you can cast to be your thesis spell. When casting that spell, you do so at +2 caster level. When you apply a metamagic feat other than Heighten Spell to that spell, the enhanced spell uses up a spell slot one level lower than normal. For example, an empowered thesis spell uses up a spell slot one level higher than the spell's actual slot (rather than the normal two levels higher).
Special
You can gain this feat multiple times. Its effects do not stack. Each time you take the feat, it applies to a new spell.