This is Gullveigarbók.
It contains studies on Gullveig, a figure from Norse mythology. She appears throughout several stories, and with each appearance she spreads darkness into the hearts of all of those who come in contact with her. This book, by Vexior, explores her as a manifestation of darkness, and argues that other evil characters are emanations from Gullveig. It is a book containing much research and also many of Vexior’s original ideas on the topic. It is illustrated and also provides prayers to and meditations on Gullveig. Legit book of black magic.
Only 62 copies were made.
I saw it at the Esoteric Book Conference, but had run out of money. Just got it in the mail today.