You have mastered a spell so thoroughly you can now cast it as a spell-like ability.
Benefit: You choose a spell that belongs to a school you have taken Spell Focus with. When you cast an inherent spell, it becomes a spell-like ability for you for 24 hours. The casting time of the spell-like ability is 1 standard action or the spell’s normal casting time (whichever is greater), and there is no limit to how often you can use the spell-like ability. If the inherent spell has a focus, you must have the focus in your possession to use the spell-like ability (though you do not need to be holding it). If the inherent spell has a costly material component (see the spell description) you use an item worth 50 times that cost when you cast the inherent spell. An inherent spell uses up a spell slot eight levels higher than the spell’s actual level.