Wrath of the Valkari (Moonflower Chronicles)

From the rooftops of Castle Wyrm, to deep inside the elven lands, Keera and Merick only have the light from an enchanted sword to guide them on a perilous journey. Old friends and new allies bolster their cause, but even this may not be enough as the door to the Underworld is waiting to claim their spirits at ever turn. Only one thing may save them, the Wrath of the Valkari - else their next breath could be their last.