When you hold this weapon, you can point it at a space you can see within 40 feet of you. For 1 minute, or until a strong wind dispels it, a thick, cold mist covers a 20-foot radius, centered on the point you targeted. The mist heavily obscures the area and counts as difficult terrain. When a creature enters the mist for the first time or starts its turn there, it takes 1d4 cold damage. You cannot use the staff in this way again until the next dawn.