Dark Guardian (Dark Series) / Christine Feehan

Jaxon Montgomery is a woman hunted. Trained by the Special Forces, honed by a traumatic childhood, she is a policewoman with an undisputed reputation. She meets her match when she is set up to be murdered by an enemy. Hunted on all sides, she can only turn to the mysterious stranger who seems more dangerous than any other she has ever known.

He ran with the wolves
Materialized from the mists
Hijacked the very heavens to his whims