Dust of Forgetfulness

A fine purple dust.
As an action, a creature can blow a pinch of dust into the air. All creatures within a 10-foot cone in front of the creature's mouth must make a DC 20 WIS save or be disoriented for 10 minutes. When they return to normal, they will have no memory of what happened to them in the last hour. The dust has no effect on plants, oozes, or constructs.