Over a thousand years, locked up in that little cell. No bed to lay on, likely no visitors, no contact with the outside until a certain little filly somehow managed to get letters through to him. He’s certainly a terrible person, but does he deserve this? Does anyone? Makes you wonder how he didn’t go insane over all those years, but perhaps that’s the horror of it. Insanity could be an escape into one’s mind, a form of freedom in a way. Tartarus was built for the purpose of no escape. If you don’t somehow manage a break out or get rescued, you will be completely aware of every moment as eternity passes.