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[[Image:Spinward.jpg|thumb|300px|The Periphery, lower right.{{Fn|22b}}]]'''The Periphery''' is a [[subsector]] of the [[Calixis Sector]].{{Fn|1}}{{Fn|5}}

Conquered in [[M39]] as part of the [[Angevin Crusade]] to conquer the Calyx Expanse (which would later become the Calixis Sector) from unnamed hordes of [[xenos]] defenders,{{Fn|42a}} the Periphery Sub-Sector of Calixis was largely neglected by the [[Imperium]]. Treated more as a buffer against the unexplored [[Wilderness Space]] between the Calixis and [[Scarus Sector]]s than the center of power and trade that its conqueror, [[Severus I]], wanted it to be. Although initially quite prosperous, it has since suffered a marked and steady decline over the past two millennia. Its natural resources and trade opportunities just were not as enticing as were those of neighbouring sub-sectors, and so the infrastructure that was needed for the region to thrive was not developed. Political sniping to prevent the overambitious Duke Severus from pursuing his goals by [[Lord Sector]] [[Drusus]] also restricted the sub-sector's development. This lack of early investment led to compounding losses of interest and inevitable stagnation.{{Fn|5a2e}}

Generations later, in [[779.M41]] Severus the First's descendant, [[Severus XIII|Severus the Thirteenth]], took control of his family's dwindling holdings, and within twenty years, had managed to get appointed to the position of Lord Sub-Sector.{{Fn|5b2c}}

Severus' spies then discovered a [[kabal]] of [[drukhari]] outcasts calling themselves the [[Children of Thorns]]. He made a deal with the Children, to make sure that the frontier worlds of the Periphery would always be lightly defended when they came raiding for slaves, in exchange for their services as special forces and assassins. Severus would spend a little over a decade after this deal was made, making strategic assassinations against [[Planetary Governor]]s who might resist corruption, and cutting as many ties to the greater Calixis sector as he could without anyone noticing.{{Fn|5b2c}}

Before Severus' plans could fully come to fruition however, [[ork]]s came out of Wilderness Space, led by [[Ghenghiz Grimtoof|Ghenghiz "Git-Slaver" Grimtoof]]. The orks hit those same poorly defended frontier worlds that Severus had promised to the Children of Thorns, and so rampaged almost completely unopposed across them, with neither Severus nor the Children able to do much to stop them. Despite initial reluctance, Severus begged Lord Sector [[Marius Hax]] for Imperial aid. Severus sent multiple emissaries to [[Scintilla]], but only one of them, Severus' granddaughter, made it to the Sector Capital alive. Lord Hax begrudgingly agreed, having recognized Severus' recent actions at an attempt at secession, but also recognizing the ork threat on his doorstep. The sector's scant military reserves (most of which were off fighting in the disastrous [[Achilus Crusade]]) were sent to relieve the Periphery, succeeding in stabilizing the sub-sector capital of [[Kulth]]{{Fn|5c2d}} (though not even coming close to eliminating all ork presence on the world{{Fn|5d2f}}), but with absolutely no hope of eliminating Grimtoof's other forces, which had become a full-blown [[Waaagh!]].{{Fn|5e2g}}

Despite their agreement with Severus, the Children of Thorns increased their slave raids on the [[humans]] of the Periphery, and the violence also attracted the attention of the [[Thousand Sons]] [[Warband of Sektoth]], who walked openly on the war-torn worlds. The Periphery was thusly declared a [[warzone]]. In response to this, Severus announced that he was annexing the rimward worlds of the Periphery into what he called the [[Severan Dominate]]. Lord Sector Hax responded by declaring Severus a traitor, however, with the sector's forces concentrated as they are on the Achilus Crusade, he lacks the military might to crush the Dominate, or any of the other enemies fighting in the Periphery.{{Fn|5c2d}}

==Systems and ObjectsWorlds==*Primary**[[Avitohol]] - [[Forbidden World]], [[Xenos World]]{{Fn|1}}{{Fn|5}}, [[Feral World]] under [[Ork]] occupation.{{Fn|2h}}**[[Cyclopea]] - [[AshenForge World]]{{Fn|22b}}**[[AvitoholGanf Magna]] - [[Mining World]] home to large numbers of [[Feral Orks]]{{Fn|22h}}**[[Kalf]] - Sparsely populated [[Frontier World]] home to deadly native lifeforms{{Fn|2h}}**[[Kulth (Planet)|Kulth]] - Sub-Sector Capital and [[War World]] in 3-way war with [[Orks]], [[Imperium]] and [[Severan Dominate]]{{Fn|2h}}**[[Sinophia]] - Staging point for the [[Angevin Crusade]]{{Fn|2h}}**[[Sisk]] - [[Feudal World]]{{Fn|2b}}**[[Sleef]] - [[Dead World]]{{Fn|2b}}*[[Severan Dominate]]**[[Cuyavale]] - [[Feral World]] beset by [[Orks]]{{Fn|4a}}**[[Fourtheden]] - [[Agri-World]]{{Fn|4a}}**[[Karacallia]] - Captial{{Fn|2i}}**[[Kokytos]] - [[War World]] beset by [[Imperium]]{{Fn|4a}}**[[Lukius]] - [[War World]] beset by [[Orks]]{{Fn|2i}}**[[CyclopeaMaesa]] - [[Frontier World]]{{Fn|2i}}**[[Ohmsworld]] - [[Hive World]]{{Fn|4a}}**[[Orbiana]] - [[Feral World]]{{Fn|2i}}**[[Stalynthia]] - [[Mining World]]{{Fn|24a}}**[[Thrax (Severan Dominate)|Thrax]] - [[Frontier World]]{{Fn|32i}}*Other**[[Ashen]] - [[Cemetery World]]{{Fn|2b}}**[[DuneAsterion]] - [[Hive World]]{{Fn|22b}}**[[Augury]] - [[War World]] with strange Warp Effects. 5th planet of the [[Drystan Construction YardsLituus System]]{{Fn|14b}}**[[Deluge (Calixis Planet)]] - [[Death World]]{{Fn|2b}} 9th planet of the [[Ganf MagnaVeles System]]{{Fn|24b}}**[[Dune]] - Special{{Fn|32b}}**[[Hervara]] - [[Forge World]]{{Fn|2b}}**[[Horizon]] - [[Frontier World]]{{Fn|22b}}**[[KalfIris]] - [[Death World]]{{Fn|32b}} home to voracious flora and fauna, primitive humans and feral Orks{{Fn|4b}}**[[Kulth Janus (Planet)]] - [[Gas Giant]]{{Fn|Kulth2b}}**[[KW-9]] - [[Gas Giant]]{{Fn|4b}}**[[Letum]] - [[Frontier World]]{{Fn|22b}}6th planet of the [[Annihilius System]]{{Fn|34b}}**[[Lolita]] - [[Agri-World]]{{Fn|22b}}**[[Manus Cenita]] - [[Hive World]]{{Fn|22b}}**[[Melqart]] - [[Feral World]]{{Fn|2b}}**[[Nox (Planet)]] - [[Hive World]] containing the [[Hive City]] [[Nellos]]{{Fn|2c}}**[[Orcus]] - [[Penal World]]{{Fn|Nox2b}}**[[Oriad]] - [[Mining World]]{{Fn|22b}}**[[OrcusPertinax (Planet)]] - [[Feudal World]]{{Fn|22b}}**[[Poina 77]] - [[Mining World]]{{Fn|2b}}**[[Porphyry]] - Former [[Mining World]] occupied by [[Orks]]{{Fn|24b}}**[[Sabriel]]- [[Adeptus Mechanicus]] abandoned outpost{{Fn|1}}{{Fn|5}}**[[Serena]] - [[SinophiaPleasure World]]{{Fn|22b}}**[[Sickle]] - [[Forbidden World]]{{Fn|32b}}**[[Skrynne]] - [[Death World]]{{Fn|2b}}**[[Solace]] - [[Hive World]], former [[SiskMining World]]{{Fn|28}}**[[Telias]] - Unclassified{{Fn|32b}}**[[Tethys (Calixis Planet)]] - [[SkrynneFeral World]]{{Fn|22b}}**[[Virbius]] - [[SleefFeral World]]{{Fn|22b}}[[Imperium]] Campaign to secure the planet has stalled{{Fn|35}}**[[Voluptua]] - [[Shrine World]]{{Fn|2b}} where hidden cults threaten Daemonic incursion{{Fn|2c}}**[[Warzone Epsilon]] - [[War World]]{{Fn|2b}}, originally named '''Helena II'''{{Fn|7}}**[[XD-777]] - [[Forbidden World]]{{Fn|22b}}

*{{Endn|1}}: [https://web.archive.org/web/20121028182831/http://app.fantasyflightgames.com/dark-heresy/calixis.shtml Archive - Fantasy Flight Games - ''The Calixis Sector] ''] {{Archive|20121028182831|15:27, 9 July 2024 (saved archive page, dated October 2012UTC)''}}*{{Endn|2}}: [[Only War: Core Rulebook]]**{{Endn|2a}}, pg. 330**{{Endn|2b}}, pgs. 332-333 **{{Endn|2c}}, pgs. 334**{{Endn|2d}}, pgs. 335**{{Endn|2e}}, pgs. 336**{{Endn|2f}}, pgs. 338**{{Endn|2g}}, pgs. 343**{{Endn|2h}}, pgs. 336-344**{{Endn|2i}}, pgs. 346-348

*{{Endn|4}}: [[Only War: Core RulebookEnemies of the Imperium]], Chapter X: A Galaxy of War, The Spinward Front, pg. 330**{{Endn|54a}}: [[Only War: Core Rulebook]], Chapter X: A Galaxy of Fearpgs. 12-15**{{Endn|5a4b}}: Worlds of the Spinward Front, pg. 33637-42**{{Endn|5b5}}: The Spinward Front, pg[https://web.archive.org/web/20080217215016/http://blackindustries. 334**com:80/?template=CX&content=calixis-index Black Industries' Calixis Sector] {{EndnArchive|20080217215016|5c15:27, 9 July 2024 (UTC)}}: The Spinward Front, pg. 335**{{Endn|5d6}}: Worlds of the Spinward Front[[Only War: The Game Master's Kit]], pg. 3384**{{Endn|5e7}}: Waaagh! Grimtoof[[Only War: No Surrender]], pg. 343 ===Uncited==={{Uncited}}6*{{Endn|#8}}: [https[Only War://web.archive.org/web/20080611131743/http://www.blackindustries.com/?template=CX&content=calixis-index Calixis IndexSalvaging Solace]] ''(saved archive page, dated June 2008)''pg. 6