Curse of the Silent

You lay a lasting curse on a target you can touch. The target has to make a WIS save DC 10+CHA modifier. On a fail the caster chooses one skill. The target cant speak and has disadvantage on all saves of that skill until the spell ends. Only one target can be cursed at a time. The caster always knows the exact location of the cursed target. If knocked unconscious or concentration is lost the spell ends. At the end of each of the targets turns they can make a WIS save. On a success the spell ends and the curse is removed.