Blood Vow by The Warden
This is book two in what is supposed to be a spin-off to the Black Dagger Brotherhoodd, I do feel that you really must be reading both of them in order to understand what is going on as the story line of the original series really moves forward in these. In these books we follow a younger set of fighters that are training for the brotherhood. I like that there are female warriors in this and it is really a lot like what the first books were like.
In a nutshell this iss done old school warden style.