Your spells are often hard to detect.
Prerequisite: Bluff 1 rank.
Benefit: A secret spell has no obvious connection to its caster, and no noticeable effects that are not integral to its function. Thus a secret fireball still creates obvious fire (necessary to deal fire damage) but a secret charm person has no elements noticeable to the 5 ordinary senses. A character targeted by a spell with no noticeable effects is not even aware the spell has been cast, though it may be possible to figure out based on how the spell affects the target (the target of a secret hideous laughter won’t know who cast a spell, but does know he wouldn’t normally laugh endlessly for no reason).
Casters using spells that would reveal the magic of a secret spell (such as detect magic) must make a caster level check (DC 11 + caster level of secret spell’s caster) or fail to pick up any sign of its magic. Characters suffer a penalty equal to the secret spell’s level to any Spellcraft and Perception checks made to notice secret spell being cast or identify it as they are cast. Any Bluff check made to pass off the effect of a secret spell as something other than a spell gains a circumstance bonus equal to the level of the secret spell.
A secret spell uses up a spell slot two levels higher than the spell’s actual level.
The Genius Guide To: Feats of Metamagic