Doublespeak

You forge a mutual understanding with up to six willing creatures of your choice. Creatures with Intelligence scores of 4 or less aren't affected by this spell.

Until the spell ends, all affected creatures may engage in doublespeak, a form of coded language. If they do so, these creatures understand each other as if speaking normally. To anyone outside of the forged understanding however, doublespeak appears to be mundane, boring small talk.

If an unaffected creature pays close attention, they recognize that this small talk holds no meaning and must make a wisdom saving throw contested by your spell save DC. On a success, they understand the coded meaning of the words for 1 minute. On a failure, they shrug off the confusion.

At higher levels. When you cast this spell using a spell slot of 4th level or higher, you may target two additional creatures per level.