Calderis

Calderis is a Korianis feudal desert world the Blood Ravens have recruited from for millennia, with the governor watching from orbit while the tribes below fight heat, feral Orks, and each other. The First Aurelian Crusade opened here: Davian Thule's handful of battle-brothers met an Ork surge that Eldar had been goading, then Tyranids arrived and poisoned Thule. Hardy industrial-revolution tech and a Solutio Prima tithe do not make it the subsector capital; that job moved to Meridian after Aurelia vanished.