Drainig cage

This spell traps target in a 5 by 5 4 foot tall cage made of a energy that bends light to hide unless you know its general location. The cage is made of a dark energy that can only be dispelled or shattered with a +3 weapon. Over a millennium this develops a circle with a radius of 120000 miles that then dispells all 8th level and below magic.  Of your enemies. The target can only spectate their worst nightmares and memories. The target is grappled, incapacitated, and frightened by every thing as long as they are in the cage, after 500 years of this they gain a uncurable madness exept by wish and modify memory. The target and everything they hold sacred and beloved stay unchanged and don't age or forget anything.