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OGsuner asked about using witches in stories so;
Imo witches should be the Praetorian Guards of Risu.
Like the Adeptus Custodes that only the temples have.
Extremely powerful but limited in deployment range and numbers, compared to the average civilian Risuners they are super soldiers.
So their existence is kept a secret because of two things
1. Intentional: The temples and shamans kept their order's existence hidden.
2. Unintentional: They are so limited and specialized not many has seen them. It's not like you get to see a schizo invade the Temple of Risu everyday, and there is no need to deploy them to fight a regular temple bandit.
Considering that Risu is a bunch of tribes with low communication, the latter method does all the work.
Any rumours from the temple grounds get muddled farther away.
For anyone living near a temple, the last time witches were deployed to fight gigayab schizo trolls were, 80 years ago. No reliable documentation methods exist so the locals forgot about them. Any merchant/migrant that saw the battles from far away would only remember vague descriptions. Which after years of telephone game, became a legend/myth.