Rift in the Sky (Stratification, Bk 3)

Despite good intentions, the Om-ray of Cersi can't resist moving through space using the M-hir dimension. To prevent the disruption of the Agreement and the destruction that it would unleash, the M-hiray, as they now call themselves, agree to leave Cersi forever to establish their own haven within the Trade Pact worlds-only to learn that not everybody wants peace.