Throughout your adventuring career, your one true love was always with you, fighting by your side. You looked forward to a long and happy life together after your adventuring days were done, but that future was ripped away. Your partner was killed in a surprise attack by servants of an enemy from your past, their body disintegrated so they couldn't be raised. You hunted down the one responsible. But in your grief, it wasn’t enough to merely defeat or kill them. You spent days torturing your enemy, making them feel as much pain as possible in the hopes it would soothe your own tormented heart. In the end, it didn’t help … but your cruelty was such that upon your death your soul was consigned to the Nine Hells.
Punishment. The brutal revenge against your enemies brought you no solace. Instead, it only twisted and corrupted the memories you have of your true love. Now when you sleep, you dream of them not as your companion, but as your sadistic tormentor, torturing you in a prison cell from which there is no escape.