The game/story centers around school kids on a modern town; and how they come in contact with the guild of dungeon crawlers: a mysterious gang of kids that speak about spooky, awesome underworld. Their stories are actually true. They've heard about a dungeon hiding somewhere. Just take any One Page Dungeon and put it on one of this:
(1. right under your school - 2. On a nearby forest, where the whole school is going next week on a trip - 3. Beyond your weird grandma's cellar - 4. On one of your uncles car junk lot. - 5. On the town's supposedly abandoned mansion - 6. Under a lost bridge, behind the industrial part of town)
You get your class at the start; just like that: fighter (though you depend on a specific kind of weapon depending on your background, because kids aren't usually trained on swordmanship), specialist (that kid that knows a lot about a certain thing, you can produce things from your bag that are related to your specialty) or mage (if you're a wizard, you'll probably discover it the first time you get in a dungeon). Use the rules of any dungeon game you normally use, but for the sake of tone, getting to 0 hp means that kids are unconscious and might need to be rescued.
Magic exists, but it only works in dungeons. When attempted on the surface, it acts dulled at best; and is easily dismissed by non-dungeoneers as tricks or sleight of hand. This happens to magic objects and, to a lesser degree, to any kind of treasure you recover from there. When a monster manages to escape from a dungeon, it's powers get subtler and must rely more on invisibility/stealth/cunning.
Normal people treats dungeon crawlers like they did with Goth Kids, Bronies, Emos, etc IRL: they mock them and despise their stories; attributing them to imagination. They're outcasts among kids, while the fashion trends awkwardly tries to appeal to them making artists and clothes about dungeons that miss entirely the point of what dungeons are about.
|PC party getting back to the underworld after recovering HP|
The underworld raw power of dungeons prevents cellphones and cameras from working, and jams most electronical devices. This prevents you from taking a selfie with a wight to prove your adventures to your friends. The most complex devices might even get hostile towards their wielders (your spotify list is suddently filled with hate messages from your loved ones; a GPS will lead you to the nearest chasm. Lanterns are usually OK, but you can never be sure if they're going to treacherously shut down right as you get into the troll's lair)
Dungeon subculture spreads mainly through drawings (mistaken by kid's edgy art), logs (mistaken as fanfic), grimoires (mistaken as new age books) and chansons de geste about their expeditions (mistaken for incredibly deep metaphors for teenage angst). Due to the inevitable impossibility of talking about dungeon experiences with normal people, there is a strong sense of comraderie between dungeoneers; though of course there are dicks who try to prevent new people from getting into it ("this kids only delve because they want to be cool, we old school delvers have been delving all the summer break and we know what dungeoning it's about"), tricksters ("treasure inspector, may I see your treasure?") and phonies ("Have you been to dungeon X?" yeah. "Dungeon Y?" yeah. "Dungeon Z?" yeah. "I've actually made up the last two" y- y- yeahhhhh of course I knew that)
* Beware: Deep speech ahead! *
Dungeons may appear anywhere; and they do not have any kind of supernatural cover up or anything (In fact, most of them might want to be noticed in order to grow). The only thing that prevents common people from knowing the magical reality is their very own drive to deny everything that clashes with their confort zone. The very zealotry of modern science (understood as denying weird options rather than acknowledging the unknown in order to investigate it) and the importance given to what society thinks we must instead of embracing the mystery of life is what keeps normal surfacers from the twisted horrors and treasures of the underworld. The importance of seeing the truth for oneself is a good theme to be enforced here.
Should a mountaineer discover the tomb of an atlantean king; the headlights on the news would be "Mountaineer goes crazy, pics from the madhouse on page 49" and handwave the whole tomb location automatically, is not like anyone is going to double check it; except dungeon delving kids who know where to read between the lines. No matter how many half-assed proofs you'll present or how good you are convincing people: No one will ever ever believe that dungeons exist unless they either see something strange with their own eyes (and cannot succesfully deny it using a weak pseudoscientific explanation) or really, really want to see a dungeon for some reason.
(If you're using a system that tracks sanity, maybe you need to be under a certain threshold to be operative on a dungeon)
|there are those who have trouble adapting to a normal world after they've found the hobby|
1 - you find out your mother never left you; she was in fact a fairy unable to escape the dungeon, but left you on the surface world to be raised as a human by your father.
2 - you're arranged in matrimony with a merfolk king of the underground sea. He'll whisper love letters to you through any kind of sink you visit.
3 - That mysterious fire that burnt the sawmill that year? a giant fire salamander. That earthquake? a troll
4 - proofs that one or many from this shirt are false.
5 - Goblins kidnap you or somebody you love in order to force you to become their king.
6 - An evil force wants to destroy the whole town in order to expand the dungeon into the surface.
|example adventure hook|