You create a glowing magical zone that detects a creature's immediate desires in a 30-foot-radius circle centered on a point of your choice within range. Until the spell ends, a creature that enters the spell's area for the first time on a turn or starts its turn there must make a Charisma saving throw. On a failed save, you decide whether the creature(s) gains a double advantage or double disadvantage on all attack rolls, spell saves, and skill checks while in the radius.

You know whether each creature succeeds or fails on its saving throw. A willing creature can choose to fail the saving throw.