Badab War - Tranquility Campaign (910.M41): By 910.M41, the strength of the Mantis Warriors had been greatly diminished, but Carab Culln recognised the folly of leaving them undefeated at his flank as the Loyalists turned their full force to the invasion of the Badab Sector. The Adeptus Astartes magister militum had already considered a change in his deployments in order to mount a renewed offensive against the Endymion Cluster, but with the arrival of the Carcharodons, the lord high commander of the Red Scorpions had been offered an unexpected asset to deploy, and so he let loose their savage ferocity against the Mantis Warriors and the unsuspecting worlds of their domain.The fleet of the Carcharodons broke out of Warp directly above the Sigard System on the galactic plane, perilously close to Sigard's swollen and violent sun, masking their presence with its solar flares. Split up into dozens of striking forces, the grey-clad Space Marines let the Sigard System have the first taste of their wrath and fury as they proceeded to devastate the numerous belt-colonies, ship-clans and asteroid citadels.The Carcharodons proceeded to devastate the entirety of the system, destroying in mere solar days and weeks what had taken millennia to build and had withstood the ravages of xenos and corsairs alike. In the aftermath of this brutal campaign, an Imperial Naval scout vessel reported the entire system littered with wreckage, their vox channels full of discordant ghostly vox signals of dead and dying ships. It was also noted that the Carcharodons had deliberately plundered and scavenged, both in terms of gear, resources and indeed Human life.It has been the conclusion of several authorities since that the choice of Sigard, with its wealth of void-colonies and infrastructure, had been the Carcharodons' first target not simply because it had long connections with the Mantis Warriors, but because after the Carcharodons' unknown voyage from the outer darkness they had need of its bounty to replenish themselves in readiness for their part in the war.The Carcharodons continue to systematically annihilate planets in the cluster known to have harboured the Mantis Warriors, forcing this Secessionist Chapter to stop using their hit-and-run tactics against the Loyalists, and mass their forces in defence of these worlds. This strategy spared the Carcharodons from having to pursue them across the Endymion Cluster to places where their foes held the advantage of support and local knowledge.First the Carcharodons ravaged the Feudal World of Iblis, smashing its infrastructure and putting its rulers to the sword, then they attacked the planet's scattered settlements and nomadic crawler-caravans by night, leaving bloody wreckage in their wake. They proceeded to turn Iblis into a wasteland inhabited only by shell-shocked survivors.The savage Chapter then moved on and attacked the blighted industrial world of Endymion Prime itself, where a small Fire Angels force already held command of a decrepit, manufactoria complex against Mantis Warriors-led insurgents. The Carcharodons launched an orbital assault, oblivious to the Fire Angels' disposition, into the contested battle, hundreds of grey Drop Pods dropping to the soot-caked planet amid a great slaughter.Honour-bound to defend this world, the Mantis Warriors were forced to respond, coming to Endymion Prime's aid with increasing numbers of their Chapter to curb the savagery of the Carcharodons' assault. Though the Mantis Warriors matched the Carcharodons with their own fierce martial skill, they were too few, and could not turn the tide of the assault. Led by their Chief Librarian Ahazra Redth, the Mantis Warriors refused to retreat and died in the defence of the planet, just as the Carcharodons' leader Tyberos had predicted.The Carcharodons continued to employ this pattern on the worlds of C'sthal and Largitor, and then the twin inhabited worlds of the Tranquility System themselves. Each battle forced the Mantis Warriors to come to the aid of the beleaguered worlds, destroying the Mantis Warriors' ability to affect the war. Now worn down and scattered, the Chapter had ceased to exist as an effective fighting force but at a great price.In the aftermath of the Tranquility campaign, the Fire Angels, having suffered heavy casualties, sought permission to withdraw from the conflict. This was in no small part due to the increasing anger of the Fire Angels against the Carcharodons, with whom they had repeatedly been at odds during the Tranquility campaign and whose savage methods they held in utter contempt. Appalled by the actions of their allies, the Fire Angels withdrew their remaining contingents from the war with honour and returned to their homeworld to rebuild their sorely damaged Chapter.With the threat of the Endymion Cluster neutralised, the Carcharodons redeployed, splitting their fleets to patrol the Loyalists' rear echelons and relieve the Minotaurs and Red Scorpions to consolidate ahead of the expected invasion of the Badab Sector. Unfortunately for the ravaged people of the Endymion Cluster, this would not be the only time when calamity was visited upon their doomed worlds, for the Carcharodons would yet return in later years to enact a final act of savagery against them.