Phoenix Tempest

From the publisher:

In the year of the Falling Moon, three clans of the eastern provinces find themselves at the brink of annihilation. Beneath the crimson sky, the land quivers under the weight of an approaching horde—Mongolian sorcerers whose unholy power stirs the dead to fight as their vanguard. The clans, fractured by ancient feuds, must now decide whether to unite or perish. Honor, vengeance, and survival clash on a battlefield where steel and spell intertwine, and even the boldest warriors cannot escape the taint of fear.