Time Prison

You attempt to trap a creature completely outside of time in a remote, inaccessible demiplane. That creature must make a wisdom saving throw, which it can choose to fail. On a successful save, it is only trapped outside of time for one hour. This means that the creature will feel as though only an instant has gone by, when in reality one hour has passed. On a failed save, this also happens, only the creature is trapped outside of time for 1,000 years before returning to where this was cast. To the creature, it will seem like barely an instant has gone by, but in reality they have been trapped from the flow of time for 1,000 years.