Matthew Cook 
Blood Magic [EPUB ebook] 

With the power of her blood magic–a dark sorcery even she does not understand–Kirin avenges her twin sister’s murder. Alone, except for the grotesque but loyal creatures she can create from souls and dead flesh, she fights to survive. When the inhuman Mor crawl up from their underground world to wage war, Kirin serves as scout and archer–and finds comfort in the arms of Jazen Tor, a sergeant in the Imperial Army. But it is beautiful, gentle Lia Cho, who can call lightning from the sky, who teaches Kirin about herself. Even with Lia as an ally, Kirin must still confront the hatred of her own kind and, together, they must face the seemingly invincible Mor.