These Fallen Swords by Ryan Kirk

Those who rise, must fall.
Ever since Radyn was young, he's dreamed of becoming one of the clan, an elite Sword or Dagger tasked with the protection of Firestone, his city. But when a violent raid steals all that he holds dear, he swears a new oath:
One day he will become the strongest Sword in Firestone.
As Radyn pursues his dream, he comes to realize his city is in tremendous danger. Enemies amass both within and without, and the city is closer to falling than anyone knows. The balance of power is shifting across the world, and Radyn and his allies are caught in the middle.
Failure is a fate worse than death, and it is all but certain as his enemies close in.
Can Radyn save his city before it's too late?