Labyrinth

Labyrinth is a structure full of demons that appears in random locations all over the Other World.

Description
The labyrinth is described as a creature that lures in people to digest. Because the labyrinth is produced by magic, you will not find a part of it if you dig around one. When labyrinths consume people they leave behind any weapons or armor their victims had. If this is done in a boss room, the items will remain there for the next challengers. Eventually, the items get absorbed and sent to solitary rooms as treasure chests.

Layout
The layout of all labyrinths have some similarities. Every floor is filled with one kind of demon as well as demons found in recent lower floors. The number of demons that can appear in a room depends on the floor you are on. On the first floor there can only be one, the second floor up to two, the fourth floor up to three, etc. Some rooms are Monster Rooms, rooms that fill up with demons until someone enters the room, meaning the invader is forced to fight a mob of demons. Other rooms are safety spots, where no demons appear. Sometimes there are treasure chests in these rooms, although it could be a mimic in disguise. To advance to the next floor, one must find the boss room of that floor and defeat the boss. Labyrinths also grow over time so the total amount of floors cannot be determined unless one actually reaches the top. The labyrinth can only be killed if someone kills the boss at the top of the labyrinth. The minimum number of floors a labyrinth has is 50.

Demons
The demons in every eleven floors are the same in every other labyrinth. However, the order they appear in will be different. The level of the demons is equal to the floor number they are found on. There is also a difference in power for every eleven floors. Every eleven floors, the power of the demons increases to about 1.5x-2x the power of demons from the previous eleven floors. Starting with the twelfth floor, one other demon found on the same floor accompanies the boss; the number accompanying demons increases every eleven floors. The regular demons found above the thirty-third floor are the bosses of the previous floors in the same order. The final boss is particularly powerful, because of its ability to possibly destroy equipment it hits. Demons from the labyrinth can also get outside to attack people. The more people who enter the labyrinth, the less likely this is to happen.

Trivia

 * Subjugation of labyrinths in their territory is a noble's responsibility. Not doing so can result in a loss of title.
 * If someone defeats a labyrinth, then that person can become a noble
 * Labyrinths in the Empire's territory is under the investigation of the Explorer's Guild, who can bring people who want to enter the labyrinth up to any explored floor, depending on the amount of nars given.
 * The Explorer's Guild can give information about labyrinths they have investigated.
 * In the first 11 floors, demons only use short range attacks, after that they start using single-target long range attacks, and by the 23rd floor they also start using AOE attacks.