From publisher blurb:
Blackdirge Publishing goes back to basics with the latest installment of the Master at Arms series. The cudgel thug is a master that most primitive of weapons - the humble club. Part fighter and part rogue, the cudgel thug combines stealth and agility with the effectively brutal techniques of an uncompromising thug. The cudgel thug's array of abilities includes old standbys like sneak attack, but also new and innovative tricks designed specifically for use with the club.
So return to the primitive, grab a handy table leg, and crack some skulls with Blackdirge Publishing and Master at Arms: Cudgel Thug.
Master at Arms - Cudgel Thug includes 7 pages of new d20 material, which includes the following:
A historical look at the club
Author's design notes
The cudgel thug prestige class
Two new weapons: the rungu and the shillelagh
Crawsmasher, and unsubtle cudgel thug enforcer and brigand