Whispers of Spitfire: Shining Serpent

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 fourth book in the story of a young shaman who walks between the tribes. Exiled by the tribe of the Sun Elk, Sings-With-Mother-Of-Shamans is taken in by the tribe of the Shining Serpent, the seaside tribe that hunts the goddess mother of the ocean, the great sea-thread called Gundr. The wolf must learn to swim and breathe as the Serpent does, but even the tribe of the serpent will be changed forever by the realizations of what really sleeps beneath the cold waves of the depthless sea.

ISBN# 978-1-716-41722-1