Only men are allowed to use magic. Everyone knows that women who use magic are witches - whores who sold their souls and bodies to the Demon Princes for dark power. They kidnap children, stealing them away to be slaves for the Demon Princes. That's why we burn witches 'round these here parts.
You'll know a witch by the demons' mark. Making the pact turns a woman's hair red as flame. That's why we burn gingers 'round these here parts. The women, at least. Ginger boys we just geld, right after we burn their mommas as witches. That's how we usually catch them. Gingers figure out real fast to dye their hair, but the demon taint always shows up in their children.
I'm sorry your wife is a demon's whore. I really am. You're a good, God-fearing man, and that's why we're going to show mercy on you. You've done nothing wrong. You couldn't have known. She probably cast her spell on you before you first met. That's why we burn witches 'round these here parts.
That's how it is in the country of Kingsland. The almighty Lord of Earth and Sky has decreed that witches must burn for their sins, and the church carries out the command with the king's support.
Stories tell of a land far away, where witches have seized control. Annwn did not burn their witches soon enough, and now the Demon Princes' whores rule over the land like queens. It is an awful place, where a man is so bound by magic that he can not even realize he is a slave to dark powers, and so the light of the Lord of Earth and Sky has been snuffed out in that black land.
You, the player It's true, sort of. Red-headed women are witches. They don't inherit it from their mother, though. They inherit it from their father. Red-headed men are carriers. The gift of a witch's magic is a blessing of the goddess Arhiatha on the royal house of Morgan which ruled over Annwn in ancient times before the Scattering.
I'll be running Pathfinder. (
http://www.d20pfsrd.com/) All witches will receive the Coven hex for free. All other PC classes will be compensated appropriately, in an as-of-yet undetermined manner.
You are all associated in some fashion with a coven of witches. All witches are women, and all women are witches. (Oh, there are surely lackeys, family members, and so forth who do not have the gift, but you are PCs. Women PCs are witches. Because I'm sexist like that.)
You do not have to be a woman. After all, it takes a man and a woman to start a new generation of witches. You are, however, a loyal servant of the coven. Whether by magic, feminine wiles, filial piety, blackmail, or the goodness of your heart, your loyalty is assured. Grandma leaves nothing to chance.
Grandma runs the coven, and has for as long as anyone can remember. Grandma looks out for her family. She's your very own Fairy Godmother, with a bit more emphasis on Godmother.
Witches really do kidnap children. At least your coven does, but don't call it that. Grandma doesn't like the word "kidnap." She calls it "adoption." Grandma can't bear the thought of a little ginger boy being gelded, or a little ginger girl being consigned to the flame. It breaks Grandma's poor old heart in two. She sends members of the coven back to Annwn to find loving parents for the baby.