In a recent story, Derke, a rising-star necromancer needed to break into his old mentor's journal. The book was protected by a myriad of spells, all of which he could break except one--the demon guardian. He called the demon and challenged him to a game. The demon agreed to play with these stakes, one hour with the book vs. the necromancer's memories of his departed wife. The necromancer agreed but then found the twists. The demon was not going to undo any of the other wards. Derke would have to break them himself in the time. The other twist was that the demon wasn't going to remove memories of his wife. The demon was going to intensify them.
It was a close game of Dwarven Board, but Derke got his king to the exit and away from the assassins.
In a final twist of his own, when the hour was up, Derke gave the book back to the demon but had removed all the contents. His mentor had turned the book into a magic satchel.