Antimagic Prison

You create a magical restraint to hold a creature. The target must succeed on a Wisdom saving throw or be bound by the spell. While imprisoned, the prisoner's magic abilities are suppressed, making them unable to cast any spells. Divination spells can't locate or perceive the target and magical attempts to contact the target from the outside are unsuccessful, with the exception of the Dream spell, which will work, but cannot be completely controlled by the caster. The caster of the prison may dictate what their prisoner can do or say in the Dream, much like visitation hours in non-magic prisons. 

Ending the Spell. During the casting of the spell, in any of its versions, you can specify a condition that will cause the spell to end and release the target. The condition can be as specific or as elaborate as you choose, but the GM must agree that the condition is reasonable and has a likelihood of coming to pass. The conditions can be based on a creature's name, identity, or deity but otherwise must be based on observable actions or qualities and not based on intangibles such as level, class, or hit points.

A dispel magic spell can end the spell only if it is cast as a 9th-level spell, targeting either the prison or the special component used to create it.

You can use a particular special component to create only one prison at a time. If you cast the spell again using the same component, the target of the first casting is immediately freed from its binding.