From the book trailer’s page on YouTube:
As plague and famine scourge the winter kingdoms, a vast invasion force is mustering from beyond the northern seas. And at its heart, a dark spirit mage wields the blood magic of ancient, vanquished gods.
Summoner-King Martris Drayke must attempt to meet this great threat, gathering an army from a country ravaged by civil war. Neighboring lands reel toward anarchy while plague decimates their leaders. Drayke must seek new allies from among the living — and the dead — as an untested generation of rulers face their first battle.
Then someone disturbs the legendary Dread as they rest in a millennia-long slumber beneath sacred barrows. Their warrior guardians, the Sworn, know the Dread could be pivotal as a force for great good or evil. But if it’s the latter, could even the Summoner-King’s sorcery prevail?