Sons of Malice
The Sons of Malice are a Renegade Chapter of Chaos Space Marines who are particularly unnerving individuals which have grown infamous amoungst the worshippers of Chaos. Fighting in complete silence, they drag captives off after raids and proceed to eat them, preferably while the captive is alive and fully aware of what is going on. Not for any trivial reason are they looked at as a chapter of Hannibal Lecters in space.
Origins
The founding of the Sons of Malice is unknown although they are suspected to be one of the Astartes Praeses, the twenty chapters tasked with guarding the regions around the Eye of Terror and preventing chaos incursions into Imperial Space.
The Sons of Malice fell when, after a victorious campaign, they engaged in a series of victory celebrations that bordered on cannibalism and other unspeakable acts, which horrified the Inquisitor attached to their force. Thinking them corrupted by chaotic taint, the Inquisitor along with a strike force of Sisters of Battle Celestians assaulted the Sons of Malice chapter homeworld of Scelus. The Sons fell on their attackers with savage anger at the interference to their chapter rites and defeated the Celestians, the captain of the first company dragging the Inquisitor to the chapter's altar and ritually sacrificing her before devouring her.
How lovely.
Needless to say the Imperium was a bit miffed at this and declared the Sons renegades. In return the Sons engaged in a hate-fueled war with the Imperium. Needing a powerful patron, the sons found this in Malal, the Chaos God of Terror and Anarchy. As Malal is directly opposed to the other chaos powers, the Sons battle the other worshipers of Chaos with as much hate as they do the servants of the Imperium. Considering this, it is surprising that the Sons have not been wiped out by either the other force of Chaos or the Imperium, unless they are receiving support from somewhere, but to be fair, Malal supposedly buffs his followers to almost Primarch levels, so at least there's a slight reason they aren't all dead yet.
13th Black Crusade
During the 13th Black Crusade the Sons fought to reclaim their chapter homeworld Scelus but were unsuccessful. They did manage to bloody both chaotic and Imperial forces however. On hearing this it is reported Abaddon did rage greatly but he was unable to do anything without arms and the rage of the arch champion of chaos did please Malal greatly.
Dark Times ahead...
Once every century, the Sons of Malice gather on the space hulk the Labyrinth, the closest thing the renegades now have to a homeworld. This holds paramount importance to them and no matter their commitments they return there at the appointment times. They bring slaves of all races to be ritually sacrificed (read: eaten) to Malal. Retreating to their cells with their captives, the Sons practice the lessons of Saint Hannibal and the halls echo with the screams for mercy.....grimdark!
Another ritual carried out is the Challenge of the Labyrinth, which a few volunteer to do every century. None are seen again but those that pass the tests are said to become the Doomed Ones, the mighty champions of Malal, enemies to Chaos and Order alike. The Doomed Ones have a special purpose; once there is 11 of their number, they will be ritually sacrificed to Malal and this will allow him to manifest in real space and lead his chosen warriors in person. With their God at their side they will unleash a crusade of hate to claim revenge on all that stand in their way. Recently the 11th warrior was chosen and the time of the coming of the Hierarch of Terror is at hand....
Notable Sons of Malice
Current Chapter Master: Kathal - Once the Captain of the Sons of Malice's elite 1st Company, Kathal was granted the honour of leading the Chapter in its victory rites after the successful Cilix 225 Campaign. It was these rights that led the Inquisitor Pietas to declare the Sons of Malice Heretics and ultimately to her death at the hands of the Chapter. It was Kathal who ritually sacrificed the intruding Inquisitor and ate her remains alongside his Battle-Brothers before they turned Renegade and found a new home in the service of Malice. After the disappearance of the Chapter Master Ba'kel Draak, Kathal replaced him as the Sons of Malice's new and current Chapter Master. Before he and his chapter were declared heretics and turned renegade, he had saved Aveline and her homeworld from the schemes of a local Heretic cult that aimed to summon a greater daemon. Commissar Aveline chose to repay the favour by turning renegade to save some of the local people at Kathal's homeworld.
Former Chapter Master: Ba'kel Draak