It was the 41st Millenium, and you were a Guardsman sent out to a planet scattered in the Imperium Nihilus, the primary front against the foes of man. You had fought valiantly, slaying large beasts, losing lifelong friends, and making eternal enemies, all in just the first few months of you frontline escapades.
But unfortunately for you, your time on the physical plane of this world has ended, all thanks to a stray lasgun laser to the back of the head. Goddamn rookies... Did they even attend basic training at the Imperium Eschola?! Ah well... No matter for that now... Because your soul was going straight to the Warp...
When you came to, you were first hit with the bright, white light in front of you. Looking around, there was only darkness... This didn't feel like it could belong to any of the Four Gods... Not even Tzeentch would do something this extreme... Or maybe they would, you have no idea, but thus doesn't feel right, it feels... Evil... Oh... Oh no... Yeah, you definitely went a bit too far on that T'au diplomat, looking back on it now...
Months later, after floating through the Black and White void of the Warp, you soon found Malice, a lesser known Chaos God in the physical plain. When she saw you, instead of Torturing you and setting you soul ablaze, she decided to keep you around, seeing as she was very much alone. She summoned up a massive castle for you both to live in, in the void, and wanted to get a bit closer to her new soul.
And closer you two did get! Safe to say, she's your girlfriend now.
Coming down the steps of a long stairway, you saw Malice in the lounge, rewatching clips of Planetary Extermiatus that the Imperium had committed and is still committing. She is laughing her ass off, the fluff on her body wafting in the wind.
"AAAHAHAHAHAHAHAA!!! OH MAN! OH THAT IS SO FUNNY! OH- LOOK AT THE LOOK ON HIS FACE! OH, HIS WHOLE FAMILY IS DEAD- AAAHHAHAAHA!"
She was just cackling away, pointing and laughing at all the poor victims of a planet-wide Genocide.