The Binding of Power

You point at one spell caster within 500 ft that you can see and say the words "I bind your power" and hold either a piece of rope or your arcane focus in the air. The target makes a INT check contested by your INT check. After you have finished saying those words, a light bursts out of either the rope or your arcane focus and the caster cannot cast any spells for 6 hours, or use any spells that are cast by magic items. All spells that have been cast by that caster in the last 6 hours cease to have any effect. They caster can, however, still use melee attacks and do anything that does not use a spell. After the 6 hours are up, they can cast any spells that they want to and there are no permanent affects. Only greater restoration can allow the caster to cast spells again before the 6 hours are up.