Dungeon

Dungeons are a supernatural phenomena that occurs in Diegen City.

Description
Every once in awhile in different parts of the city, these "dungeons" appear and can terrorize the people. The dungeons are areas of space that appear in even the most populated parts of the city that resembles a door. The door is usually invisible to the normal eye, but to someone with super-powered abilities, it's easily seen. As soon as a door to the dungeon appears, the DCHQ will pick up a massive spike in "creature energy" somewhere in the city and send someone there to take care of it. The door is usually colored a multitude of different colors, and will never appear the same way twice. The colors don't really indicate the level of danger or anything, it just happens. The door can only be unlocked by a special key a super-powered being can generate. The key itself can be called upon quite easily, either by focusing or otherwise, but it appears in the hand of the user. By pressing the key into the door, the super-powered being can enter the dungeon. The door will open and they will be allowed to walk into it.

The inside of every dungeon is usually brimming with life initially, in a very cartoony way. Flowers may be dancing or the sun may be smiling. However, as soon as the super-powered being takes six steps into the dungeon, everything will instantly turn deathly serious. All of those cartoony effects will fade and it will become a war-zone. The "creatures" inside the dungeon will attack, and eventually kill, anything they see unless they are tamed beforehand. The creatures do not go by any one specific name, and most of the time, they can not escape from this prison. However, if someone with malicious intent manages to tame the creatures, they will be able to force the creatures out of their dungeon and attack the city with them. Outside of the dungeon, these creatures are actually more malicious, violent, and downright destructive. Under the supervillain's control, they can help them destroy an entire city if they wanted to.

That's why it's imperative that the dungeon is destroyed before a villain gets their hands on it. To destroy the dungeon, one need only defeat the "creature boss" at the end of it. Once the creature boss has been defeated, the space that the dungeon occupied will disappear and the city will be safe from that once more.

Normal people are actually extremely susceptible to being controlled by the dungeon's influence. Some humans will end up wandering into the dungeon, but the creature boss will not destroy them if it has some purpose. However, due to them not having any sense of their own, they will usually kill the person as soon as they enter the dungeon.