Blade of Secrets: Book 1 of the Bladesmith Duology - Tricia Levenseller

Faber & Faber - <p>Eighteen-year-old Ziva prefers metal to people. She spends her days tucked away in the forge, safe from society and the anxiety it causes her, using her gift to craft unique weapons imbued with magical power. When Ziva takes a job from a powerful warlord, the result is a sword capable of stealing its victims' secrets. A sword with the strength to topple kingdoms. The warlord's sinister plans for the weapon soon become clear, and Ziva has no choice but to take her sister and flee. So begins an epic quest to keep the sword safe until they can find someone worthy of wielding it - or a way to destroy it entirely.</p>