Something like that. The forms can vary a lot, and some people can manipulate them with intent, but most curses are formed involuntarily. [ He frowns. Actually, not quite the word he wants. "Involuntarily" sounds like people might still know they're doing it, even if they don't want it to happen. ] ...mm, maybe I should say unconsciously, instead?

Sorcerers are vanishingly rare outside of Japan, and curses mostly seem to be concentrated there, too. I don't know all the theory behind it, but I think it's a function of Tengen's barrier. [ And also a function of WEIRD WRITING DECISIONS that the player is also hard pressed to explain, sigh. ]