Hermes, the Guide of the Dead, is reputed to have written the "Emerald Tablet of Hermes" in which he wrote about the "One Thing" which became the first principal of alchemy. Cerberus was like a little puppy with Hermes, thus at some point during the last decade before the End of the First Age of Magic (966 GUE), at request of Glorian of the Knowledge, he re-chained the Hound of Hell at the Tomb of the Twelve Flatheads in the Dungeon of Zork.