From publisher blurb:
The blackguard is the prototypical bad guy, without remorse, caring not for your thoughts and feelings; only the will of their divine master is their motivation (as long as they get their cut). Nothing else matters. The epitome of a walking terror, a blackguard is the bane of anything that is good and holy.
The Blackguard Portfolio is your one-stop source for new rules and information for the blackguard prestige class. Inside you will find:
New feats, dirty tricks, spells, and magical items to make your blackguard character more menacing, or your game's blackguard NPCs more dangerous;
New artifacts for the blackguard, such as the blackguard band, which gains new powers as you gain levels;
A new incantation to turn a paladin's holy avenger sword into a weapon of spite and malice;
A new blackguard prestige class called the Sniper Blackguard that fights from range.