Upon Dark Wings. The Immortals' War Trilogy, #2

When Shay betrays her post and steals away the most powerful resource in the universe, she unwittingly summons an ancient foe. When Ayla wakes with no memory of her past, she knows only two things: first, she is being hunted. Second, she can't outrun her enemies. When Zrail encounters an enemy immune to his attacks, he finds himself irresistibly drawn into the storm. When Chukka realizes the chaos he's turned up, he recognizes what nobody else sees: the fight for the future of the universe hangs in the balance, and he's willing to do anything to survive.