Choose one humanoid that you can see within range to make a Constitution saving throw. On a failed save, you can choose to wither one of its legs or one of its arms. If you wither a leg, the target falls prone and can't stand up for the duration. If you wither an arm, the target drops any item it is holding with that arm, and until the spell ends, it can't use that arm to use or hold items, to make attacks, or to perform somatic components for spells.