Anti-Magic Manacles

Shimmering steel manacles interlaced with silver.  The manacles hold the wearer's hands crossed at the wrists.  The lock is built in. 

These silvered manacles are unbreakable. They have a complex locking mechanism (DC 25) to unlock. Failure to pick the lock by 5 or more breaks the thieves tools. The spell Knock will lower the DC by 10. Otherwise, the lock can only be opened by the jailer's key.

When put on the wearer of these manacles is drained of all spell slots if they have any, and take 2d6 psychic damage. While wearing the manacles, the wearer is prevented from gaining spell slots by any method. They are also prevented from casting cantrips.

Casting Dispel Magic on the manacles allows the casting of spells and gaining of spell slots for 1 hour but does not unlock the manacles. When casting any spell that has a Somatic component, the wearer must make a DC 15 Dexterity + Proficiency check at disadvantage as their hands are still bound awkwardly together by the manacles. On a failure, the spell fails.

Notes: Control, Debuff, Wristwear, enchantment