A contested frontier region of space forming the shifting boundary between Armada and Cortex territory. The Line Worlds are marked by abandoned colonies, fortified outposts, and recurring skirmishes, where sovereignty is unstable and doctrine is tested through conflict rather than law. Once marginal systems, after the Ashen Accord regulated the nature of the conlict, they became its flashpoint, a space sandbox hosting narrowed wars, proxy engagements, and Commander deployments as both powers probe for advantage.