Tazrakan's Antimagic Cradle

You point at a humanoid creature within range that has the ability to cast spells. Luminous magical string shoots from the tip of your finger and binds the creature's hands together, as well as its mouth if it has one. The creature must make a Strength saving throw. If it succeeds, the binds are broken, and if it fails, it will be unable to cast spells. This saving throw is repeated every turn. The string connecting the your finger to the creature's binds remains present until it is dispelled, and will extend up to 100 ft., at which point the caster will not be able to move further away from the creature. Additionally, during the duration, the creature is unable to speak and has disadvantage on Dexterity checks and saving throws.