Farlander

Farlander - Col Buchanan Decent fantasy set in a war torn world. The Roshun offer a service that if one of their clients is killed, they will take out vendetta against the killer.
Nico finds himself pulled into this brotherhood, being the first apprentice his master has taken on.

Most of the details and world building are done well, but Nico appears to be more of a way for the Roshun to be explained as he goes through training and his first mission.