Fleur and Gabrielle Delacour need a five hundred word essay on British wizarding culture by Monday. Hermione mentions, in passing, that Potter, Weasley and Longbottom run a Dungeons & Dragons night every Friday. The dice are enchanted. The rules are binding. The Master of the Dungeon is in a vengeful mood. By the time the treasure chest opens, no one is wearing very much, and the Delacour sisters have decided they will be returning every week. For research.