Deff Krusade
Overview
The most devastating Xeno attack in Eternum's long history, the Deff Kroosade, also known as the Green Kroosade and many other Orkish names, devastated the once prosperous Arkamedes subsector and pushed the Imperium out. Imperial records are scant, though the Greenskin menace originated from the Orkish world of Mujar. Mujar had been mostly left to its own devices as the Arkamedean nobles wasted Imperial military assets for interhouse rivalry and wars, which would prove to be its undoing.
An Ork fleet, captained by notorious warboss Big Greenie da Eyerippa Meanie, arrived in orbit and through large displays of force, formed a WAAAGH!!! from Mujaran Orks. The Deff Kroosade spilt forth from Mujar, laying waste to Imperial worlds. The subsector nobles, whose influence over Militarum Command was substantial, perceived the WAAAGH!!! as nothing more than a large raid and they continued their interwars to the significant detriment of Arkamedes. By the time the nobles realized they were facing an army, Arkamedes was already lost. Beseeching the greater sector for aid as the subsector capital Ulaangom came under siege, they received no reinforcements as Orks pillaged the subsector. Sector Eternum was suffering the worst of the Gafrey Schism during the Deff Kroosade, and with the Imperium focused on the far more crucial Caligulas subsector no relief would come for Arkamedes. The nobles who left Arkamedes either fleeing a besieged world or who fled before Orks reached their world joined the refugee diaspora, being resettled on worlds that bordered Arkamedes and throughout the sector. The former Arkamedean families of both nobles and menials hold a deep hatred for the Orks whole stole their home, and few even hold their grudge against the Imperium for failing to aid them, a fact that would help the Rotbelchers during the First Poxwar. Arkamedean families have passed their loss through millennia, and even in the 41st Millennium its almost given that any conversation with an Arkamedean would veer towards their grand plan to reconquer the subsector.