About “Rauðskinna”
Rauðskinna, also called The Book of Power or the bible of all wizards, is a legendary Icelandic grimoire about black magic. It is said to have been buried with Gottskálk the cruel, Gottskálk grimmi Nikulásson of Hólar, after he stole it from a wizard named Jon from Svalbard. (Summary adapted from Wikipedia, CC BY-SA 4.0.)
Some summaries adapted from Wikipedia, CC BY-SA 4.0.