Blackjackets, named after their dark outfit, are the silent bodyguards of Druma’s many merchant ships and vessels. They keep watch, day and night, and defend their charges with zealous vigor.
Mostly fighters and monks become Blackjackets, but barbarians, rogues, and rangers are sometimes called to its ranks as well. Casters, paladins, and bards find the lifestyle to demeaning for their other pursuits and almost never take up this career.
Blackjackets are formidable ‘readers’ and are almost impossible to ambush. When they have their target in view, they pursue it relentlessly. Because of their charges, they learn the Druma tricks of trade and are also able to buy and sell at reduced cost.
Sources: Pathfinder Chronicles Campaign Setting