Arteside sub-sector

Arteside sub-sector is a narrow area located in the Eastern Fringe. It encompasses a major, stable warp lane from Vigilius sector northwars via a narrow strip of space that hosts seven inhabited worlds. East of the sub-sector is located the infamous ork sporeworld area known as Iota-Omicron region while on the west a large gap between the galactic arms begin.

Its capitol is the proto-hive world Arteside Major which is governed by council of chartist captains who are flagged in Arteside.

History
Arteside sub-sector was recognised by Terra after the Great Scouring and it was separated from the Vigilius sector. This allowed thr sub-sector to host its own battlefleet which was designated by the Imperial Navy as Battlefleet Arteside.

Waaagh! Morkdred
In the late-M40 the orks of the Iota-Omicron region were united by Warboss Morkdred who invaded the Arteside sub-sector. Defenses on the worlds of Arteside sub-sector proved to be lacking and the worlds of the sub-sector fell one after another in just a few years.

As even the capitol, Arteside Major, failed to defend itself succesfully, the Waaagh! had free route to Vigilius sector to make war and plunder.

Departmento Munitorum formed the Vigilius Reclamation Army that destroyed, with the titan legions Ardens Aestus and the Firewyrms, the ork Waaagh! after it was repelled on Magna Cupal.

Worlds of Arteside sub-sector were cleansed pf the green filth in the following decades and the major worlds resettled. Aftermath of the Waaagh! saw many worlds turned into fortresses. Worlds of Arteside sub-sector were re-inhabited in the following decades by the efforts of Vigilius sector that needed to keep the northern warp lanes open lest it was to rely on only one lane to connect to the wider Imperium.

Battlefleet Arteside
Constructed after the Waaagh! Morkdred, it features many newer classes and is almosy wholly made up of Lunar class cruiserd and Dauntless frigates.

Battlefleet Arteside is the sub-sector's main militant arm and has countered innumerable invasions and pirates of orks, eldar and other xenos races.