Volume 2.
Collected EditionsX: Big Bad (#0-4)X: The Dogs of War (#5-8)X: Siege (#9-12)X: Better Off Dead (#13-16)X: Flesh and Blood (#17-20)X: Marked For Death - Enter the Mark (#21-24)
— Description from Comic Vine community (comicvine.gamespot.com · https://comicvine.gamespot.com/x/4050-57406/).