The Witch of Brunla, part 2 is a manual in The Blood of Dawnwalker.
“Adelheid started dabbling in witchcraft from a young age. It is said that every year she would join other witches gathering on Brocken Mountain during Walpurgis Night and lay down with the Devil himself. In exchange, he taught her a very special spell, one that would allow her to leave a stigma on the souls of unaware people.”
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Transcribed from DawnwalkerDB.