Não tenho 100% de certeza, mas poderia ser Espada de Kingmaker ?
The Skai and the Tyr were one people long ago. But that day is lost in the mists of time. And now the Skai have sent a warrior to find the Rune Blade that could slice through the darkness of blood and violence that had falled [sic] across their land.
É um tipo semelhante de história. Figura paterna e um filho, lâmina mágica.
Um dos comentários tem uma descrição mais longa:
Mouse is a slave. Dubbed Foxmouse because of his flaming red hair, he is now known as just Mouse and he is about to make his escape. Two nights ago his sole friend in the world was savagely assaulted and murdered while he watched and that horrific act simultaneously crushed Mouse and did away with any reason he had to stay in the filthy hole he has lived in for as long as he could remember. While on his headlong flight to freedom, Mouse runs into his past in the form of a hulking Tyran clansman on a journey to find his long-lost nephew. Suspecting Mouse may just be that boy, Cullin dav Medroch dubs the boy Kian and takes him under his wing. On their way back to Tyra, Cullin and Kian encounter a determined swordswoman by the name of Kerridwen who is on a quest of her own. When Kerridwen and Kian accidentally cross blades a bond is forged that takes them both unpleasantly by surprise and shapes the direction their paths will take from that point on.