Ari Marmell 
The Goblin Corps [EPUB ebook] 

Welcome to the Goblin Corps. May the best man lose. Morthûl, the dreaded Charnel King, has failed. Centuries of plotting from the heart of the Iron Keep, deep within the dark lands of Kirol Syrreth–all for naught. Foiled at the last by the bumbling efforts of a laughable band of so-called heroes. Still, after uncounted centuries of survival, the Dark Lord isn’t about to go down without a fight, particularly in battle against a mortal! No, the Charnel King still has a few tricks up his putrid and tattered sleeves, and the only thing that can defeat him now may just be the inhuman soldiers on whom he’s pinned his last hopes. From the Trade Paperback edition.