Congratulations on finishing the game. I had the void Scroll in my inventory so I don't know what would happen if you didn't have it. I would have gone back and killed all the devils if I could get back in. The game ended with going through the wall and if I wanted to continue, I could, but no quests.
I'm almost through with Might and Magic 7. Getting Grandmaster in most things now. It is my favorite too!