Heart of the Panther by Michelle Love

The daughter of an English farmer—plagued by vivid dreams and sinister voices—might be the one blessed by Freyja to protect a Viking clan on the brink of war with the gods.

He is her sin. And she is his salvation.
Consumed with grief, Elara struggles to move forward after the death of her mother. For years, Elara’s dreams foreshadowed things that had yet to pass—a coincidence she’s tried desperately to ignore.
Until now.
Now, the visions demand her attention, showing her a world coated in ash, plumes of smoke, and a man who both terrifies and intrigues her.
Then, there are the voices—disembodied, haunting, and relentless. The unseen whispers call to her, beckoning towards something foreboding, until a mysterious woman appears. Elara isn’t sure whether it’s a dream or reality when the shimmering figure grants her a boon to keep the darkness at bay:

A massive black panther, dripping with shadow.
When the dreams of ash turn real, Elara finds her father at the mercy of a hulking warrior. Driven by instinct, Elara flings herself between the blade and her father, offering anything to spare his life.

To her surprise, the warrior accepts. But what he wants isn’t silver. He wants a war prize.
He wants her.