A credo is a mix between a profession and a set of beliefs. Certain personal beliefs allow for certain credos. The credo has certain skills, benefits or mechanics associated with it that are denied other credos.
Witch Hunter.
"If she floats, she's a witch, and should be put to the stake and burned to a cinder. If she drowns, then accept this beautiful, wonderfully scented, flower -- would you just look at the color! -- as my way of saying that I'm really, really sorry! Enjoy your day!"
The Witch Hunter specializes in locating and taking out witches -- or other practitioners of magic -- and witches' covens. By burning the black sorceresses at the stake, he fuels his martial skills.
Witch
"They happily quaff my potions down -- like they were honey-wine -- for years, but all it takes for the stakes to be raised -- if you know what I mean -- is one old cow falling ill. I mean... it's not like they really needed the milk anyway."
Seid magic allows the witch to throw little curses on cows, querns, wells, and various household objects, to feed both herself and her magic. Together with other witches in a coven, she can perform rituals to curse entire tracts of land.
Farmer
"We don't take kindly to your kind around here, stranger."
The Farmer is the village work horse: Plowing, harvesting and sowing fields with ease, speed and results. Years of hard labor has given him the strength of an ox, and when he forms up with other farmers in a mob, they become a formidable fighting force, matched only by professional warriors.