One of my friends wrote this book, and it's free for amazon kindle right now.
BURY YOUR HUMAN SOUL IN THE HEART OF A WARRIOR!
“What are you, boy?” asked the Valkyrie.
“A murderer,” Rowan said. “Nothing more.”
“I will be the judge of your worth, now.”
* * *
Rowan Jun awakens to a new, violent world when the Slaveship QuellTruth crashes on the planet Unata.
The human struggles to reconcile his bloody past with that of his new home, and sets out to become the greatest warrior Unata has ever known!