The Blood of Queens - A Tide of Sacred Ice, #2

War!  The Cyngellian army is on the march to Little Creek. For the harsh and acrimonious Captain Blackboot and so many soldiers of the newborn empire, this is the moment they've been waiting for - an opportunity to repay debt. In the Hammer Mountains, Róinn bestows a dangerous magic key upon his most trusted student, Sam, who along with his hot-headed friends Fnugg and Betty Sue must set out to find the queen of Little Creek, a task that soon proves to be a far greater challenge than first anticipated. With a handful of trusted men, Oliver leads a quest to the Moonsea to muster an army against the Cyngellian tyranny.
But with the return of the seasons, an ancient evil has awoken in the ground, a terrible threat that should have remained buried under Aladria's ice and snow.