I know, its possible I suppose a soul could become totally destroyed and ceased to exist, but lets say its not and that a soul will live forever but it needs to be placed in a containment of sorts, well maybe there are souls who are too bad to put in peace, like maybe cade cause he created hell even if it was an accident, the person who monitors peace might see him as upsetting the balance and cast him away, but to where exactly, he wasnt put in malivore cause even after stefan stabbed him, he was mentioned so it wasnt some big gap in the mfgs memories or anything. I see malivore as oblivion i guess, just a place of eternal darkness. But im sure there are souls who didnt make it to peace, so what dimensions or dimension would you think they'd be put into?, purgatory has been explored, hell has been explored, the prison world is currently occupied by kai and can only be accessed by a bennett or gemini witch so we're kind of out of places to put the souls except back on earth, maybe they are put on another planet like mars or something.
People might say all the bad souls just go to peace because like dahlia and esther made it there for example but i dont like that because first off maybe whomever monitors heaven saw esther and dahlia who both tried to kill the vampire race as redeemable, maybe that earned them a free pass, secondly it would be a bit pointless in watching dont you think if you knew every villian outside of kai was going to make it to heaven eventually, its a good thing but its pointless in a way.