Disguise Spell( Deities and Demigods, p. 50)
The deity can cast spells without observers noticing it.
Perform 12 ranks, Bardic music,
The deity has mastered the art of casting spells unobtrusively, mingling verbal and somatic components into its music and performances so that others rarely catch the deity in the act of casting a spell. Like a silent, stilled spell, a disguised spell can't be identified through Spellcraft. The deity's performance is obvious to everyone in the vicinity, but the fact that the deity is casting a spell isn't. Unless the spell visibly emanates from the deity or observers have some other means of determining its source, they don't know where the effect came from. A disguised spell uses up a spell slot one level higher than the spell's actual level.