the Mana-Wilds (the Cold Iron Chronicles) #5: Fangs of Iron

Taking Vellumis is one thing, holding onto it is another.

With resources stretched thin and a burgeoning new nation that they must protect from those who seek to shackle all hope, Doctor-Commander Cold Iron, Arazni and Myrmidon must navigate a new kind of Battlefield known as 'Statesmanship'. But with a Hobgoblin Warlord, Lost Crusaders and the ever-imposing threat of retaliation by the hordes of whispered undead, it may come to the Doctor-Commander to make a few Deals with the Devil if he is to live to see the next sunrise...

Unless he is to see a Fallen Warrior thrust their rapier down his heart first....