Warhammer - Orion: The Tears of Isha by Darius Hinks

Winter approaches, and the god-king Orion leads the wild hunt one last time before he returns to his slumber. But a dark power is rising in the groves of Athel Loren, corrupting beasts and elves alike. As Orion's servants hunt for a new host for the forest-king's spirit, the daemon Alkhor's plan comes to fruition, threatening not only the wood elves, but the realm of Athel Loren itself...