The Drowning Dark. The War of Memory Cycle, #4

Darkness Neverending... Chaos reigns in the Risen Phoenix Empire. As an endless night grips the land, ex-Guardian vessel Cob and crippled Ravager Enkhaelen must journey to replace the Seals and mend the damage of four hundred years past. But Enkhaelen's enemies are legion and his friends vanishingly few; even Cob won't count himself among them. If they can't lay their grudges aside, their hatred may doom the world.
Captain Sarovy plays for smaller stakes: the lives of his soldiers and specialists. The Shadow Folk want revenge, but they'll take service instead. In such dire straits, the deal is tempting, but as all in Bahlaer will discover, they still have much to lose.