Forbidden Book
The Forbidden Book is a magic book Satan owns that has the power to make two people switch bodies if both people are touching the book at the same time. The creator of the book, a witch named Grisella, gave the Forbidden Book to Satan as a present because she knew that book would be a catalyst for change in his relationship with Lucifer. Satan had no desire to change his relationship with Lucifer; however, so he made sure to stay away from it. Grisella's prediction did eventually come true, starting in Lesson 9 of Obey Me!'s Main Story.
Story[edit]
Obey Me!'s Main Story[edit]
In Lesson 9-7, after an argument with Lucifer, Satan goes to his room to figure out what books to take with him when he is evicted from the House of Lamentation. MC follows Satan and he warns them not to touch the Forbidden Book, explaining that if two or more people touch it, they will switch bodies. Satan wants to make a pact with MC solely because it will upset Lucifer but MC refuses, as they want to earn Lucifer's respect. This angers Satan and he threatens MC. However, Lucifer shows up to stop him which causes another argument between the brothers. In the heat of the moment, the books in Satan's room start flying off the shelves, including the Forbidden Book. Lucifer catches the book but as Satan grabs it back, the magic activates, and the two switch bodies.
Satan does some research on the subject and learns that the effect is supposed to last for several days. However, in Lesson 10, when Mammon and Leviathan come up with a plan to have Lucifer and Satan make up, they find that the effect of the book does not work inside the alternate universe of Dogi✩Maji. The reason for this occurrence is not specified and they remain switched even after beating the game. As a result, Lucifer comes up with a plan to ask a witch in the Human World to lift the curse, as she is the one who created the Forbidden Book. In Lesson 11, Lucifer, Satan, Mammon, and MC travel to London to find her. The witch agrees to lift the curse after the group solves her murder.
Meanwhile, in Lessons 10-A and 10-C, Asmodeus and Beelzebub enter Satan's room when they realize the other residents of the House of Lamentation are missing. Beel comments on how messy Satan's room is so the two of them decide to pick up some of the books left on the floor. One of these books is the Forbidden Book. As Beel hands it to Asmo, he notes that it is ragged and worn out. When Asmo takes the book, the magic of the book activates and they switch bodies. The effect does not last long and after they switch back, Beel notes that the Forbidden Book is even more worn out than before. Asmo determines that the book must become more worn out with every use and Beel guesses that the effect also gets weaker with every use which is why he and Asmo only switched for a short period of time. Asmo decides that the Forbidden Book looks like it has one more use left and wonders who will switch next.
The answer to the question is revealed in the chat Help! As it turns out, Luke and Simeon went to visit Satan in his room but he wasn't home. While they were there, they touched the Forbidden Book and switched bodies. The two angels message Solomon for help and he agrees to see what he can do. Presumably, the Forbidden Book is no longer active as it has been used too many times.
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