Chose a single spell
Prerequisite: Spell Focus (same school of magic as the selected spell), Spell Penetration
Benefit: The chosen spell becomes more potent, adding +3 to its DC, and is cast with a +2 to overcome spell resistance.
Special: This feat can only be taken once, as it suggests an obsession with a particular spell, so much so as that it could be considered your signature spell.

This feat is particularly useful for NPC spellcasters. If they have a spell that they are particularly fond of they could take this feat to keep it challenging even at higher levels. You may want to have the caster personalize the spell a little, make it his own, if only in appearance. You do not have to change the spell’s effect in any way, just make it appear more stylized.

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