Company of Misery
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Those unfortunate souls were once known as the Desolate Brotherhood and since their gene-seed degradation they were sent on impossible mission on Death Worlds,Space Hulks and Quarantined Worlds,the Imperium hoping that they would most likely die and everyone would forget about those poor bastards. Sadly for the Imperium,they always finished their mission and for this they were assigned to an even more impossible mission which sent them into a spiral of despair.During this mission in the Acidic Swamps on the world of Misery,they said "FUCK IT!" and pulled a Night Lords and Iron Warriors on the Imperium.The Brotherhood changed their name to Company of Misery and are now sworn enemies of the Imperium.
I forgot to mention that they are another warband in the category "Why the fuck do we even exist?".A lot of potential,but barely used.