To spinward (hence the name) of Calixis proper lies a wild and vast sub-sector called only 'the Periphery' (if you keep going you eventually reach the Scarus sector). The sub-capital (such as is) is the war-torn world of Kulth. The area is also known as the Spinward Front - for the region has been involved in a three-way struggle between Imperials, orks and the renegades of the Severan Dominate for many centuries. The Imperium usually has the upper hand, but with the Reaving of Finial and the Vortex opening up...no doubt the orks and rebels will rise again!