At first glance, Necro Prison appears to be a standard correctional facility borrowing from movies such as Robin Hood and Indiana Jones—a grim but orderly 24x36 compound housing low-risk offenders and guarded halls of concrete and steel. But beneath this mundane facade lies a descent into horror. Whispers echo through the upper cells—rumors of inmates who vanished after angering the wrong guards, of doors that only open one way, and of screams that rise from far below.
As one ventures deeper into this subterranean labyrinth, the sterile uniformity gives way to warped architecture, suffocating darkness, and a creeping sense of dread. Rooms become twisted and misshapen, lined with occult symbols and iron restraints. At the very bottom lies the final chamber—a sadistic torture room shrouded in flickering crimson light, where a rickety wooden bridge spans a massive acid pit, its stench choking the air. Here, prisoners are hung over the bubbling abyss, left to dissolve slowly as a warning to others. And beyond this grotesque execution ground, a demonic portal pulses, ancient and alive, feeding on pain, fear, and the souls of the damned.
Necro Prison isn’t just a dungeon—it’s a descent into a corrupted justice system where mercy has rotted, and escape may mean confronting something far worse than death. Perfect for horror, dark fantasy, or infernal campaigns, this map will leave your players questioning every locked door—and every decision they make.
Prison Features
Warden’s Office
Stacks of paperwork, disorganized records, city maps, and a heavy ring of prison keys cover every inch of the oversized desks, painting a clear picture of a warden drowning in bureaucracy. Rules, red tape, and endless regulations have forged a temperamental, short-fused official. Anyone seeking an audience here must tread carefully—this is a volatile space, and the tension is palpable.
Main Lobby
Iron bars encase the central processing desk, where criminals are formally registered before being sent into the depths of the prison. The atmosphere here is sterile and foreboding, like the mouth of a beast ready to devour.
Low-Offense Cells
Perched along a dimly lit battlement, these cells house petty criminals and first-time offenders. From their narrow slits of windows, they can see the horror below—starvation, torture, and hopeless cries—a brutal reminder of what happens when you defy the City twice.
Lower Prison
This is where hope goes to die. Reserved for serious or repeat offenders, the lower prison is a grim, putrid pit of misery. Starvation is common. Torture is expected. Survival is not guaranteed. The screams echo endlessly.
Torture Chamber
To the left of the prison block lies the torture room—filled with racks, blades, and tools designed to extract confessions or break the spirit. The Warden has direct access from his office, ensuring swift punishment for disobedience or the sudden "need" to extract a hidden truth. Guilt is not presumed; it's forced.
The Altar
Beneath the prison’s known structure lies its most horrifying secret: a chamber of occult ritual and blood sacrifice. Inmates know—if someone is taken through that door, they never return. Down a double staircase, an acidic pit bubbles and hisses. At its edge stands a black iron altar, soaked with blood and humming with dark magic, forever hungry for another offering.
Graveyard
Beyond the Altar chamber lies a sealed graveyard, eerily older than the prison itself. Crumbling tombstones lean in every direction, and something foul clings to the air. A partially disturbed grave may hold clues—or horrors—lost to time.
Crypt
South of the graveyard is an ancient crypt, rumored to contain the remains of the City’s original rulers… or something more arcane. Deep within, a secret passage can bypass the acidic pit entirely—if the Heroes are clever enough to find it. Otherwise, the only path forward is treacherous.
Sewer Dungeons
Across the acid pit lies a twisted labyrinth of machines, crates, and hoists—used to lower cages of victims into the green inferno. The acidic runoff pours from every pipe and grate in the compound, as though the prison itself feeds a malevolent force with its torment.
Acid Pit
This wide chasm of bubbling green acid lies between the Altar and the Sewer Dungeons, slowly dissolving anything unfortunate enough to fall in. The nauseating glow casts shifting shadows and fills the space with the stench of rot and death.
Rickety Bridge
To reach the final chamber, the Heroes must cross a dangerously aged wooden bridge. Warped and creaking, it sways over the acid pit, daring the brave—or the foolish—to trust its steps. A final physical trial before the ultimate confrontation.
Final Chamber
Here lies the heart of the Necro Prison’s corruption: a demonic portal, pulsing with otherworldly energy. Is it a gateway? A summoning point? Or a sentient trap? The walls are lined with the hanging remains of those who came before—testaments to failure or sacrifice. The green glow of the portal beckons each Hero with whispers of power and glory. Will they resist... or surrender?
Included
- A 24x36 battlemap of a fantasy prison and occult chambers by me, Dread Maps (https://patreon.com/dreadmaps)
- 5 Character / NPC tokens by RedCraft (https://marketplace.roll20.net/browse/publisher/2169/redcraft)
- Playlist of thematic soundtracks by Michael Ghelfi Studios (https://michaelghelfi.com)
