Whispers of Spitfire: Sun Elk

From the back cover:

In the midst of a new ice age, brave shamans hunt gods born of black glass and steel. The blood of these gods is sacred, and the shamans of each tribe are marked with the sacred blood in ways that give them strange, supernatural abilities.

This is the first book in the story of Wind-Spark, a young shaman of the Eikus Tribe. It is a tale of initiation in the primal wilds of a far-future ice age where tools of stone and bone are used side by side with shards of steel stolen from the gods themselves.

ISBN# 978-1-67816-807-0