|Merode Mousetrap, c. 1427-32|
After the dragons lost in their war against the gods, they turned to other pursuits. Partly due to spite, and partly due to boredom, some of the dragons began devising and setting traps among the spheres. They created the Mousetrap Realms to catch and kill Spherewalkers.
The Mousetrap Realms have one way in: a Gate which opens into a new realm, beckoning a Spherewalker to come explore. But unlike normal realms among the spheres, the Mousetrap Realms have no way out. Either their Gate works in only one direction, opening only into the realm, or else once entered, the Mousetrap Realm becomes a more active and deadly trap.
Death by starvation. Death by plenitude or lack, whether Earth, Air, Fire, or Water. False epiphanies. Entombment. World-creatures. Treasure of Infinite Counting. Doppel-craft. The dragons have never lacked for imagination in devising their traps. And they were masters of misdirection.
Humans have often attributed the creation of Mousetrap Realms to capricious gods or demons. Few have seen the Dragons' Stamp: The House of Knives, The Box of Under, the Ocean-Hole, Mother of Cankers, the Roundel, the Whorl, Pop-Up Drop Down, the Meat Grinder, the Flower That Ate Itself, and The Limbless Tree. Even the names of the Mousetrap Realms sound like curses.
There are in fact hundreds of Mousetrap Realms on record at the Library of All Worlds. As many as one realm in one hundred may be Mousetrap Realms. It is wise to consult the collection of spherepaths within the Library of All Worlds, or the Chamber Platinum's special collection (these are usually the most up-to-date) before planning a particularly long journey among the spheres.
Most Spherewalkers will encounter a Mousetrap Realm if they travel far enough.