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The Necropolis Sanctum

The Necropolis Sanctum

The Necropolis Sanctum

Overview

Hidden beneath the shifting sands of the Glass Desert, the Necropolis Sanctum is the final resting place of a forgotten dynasty of death-worshipping kings. It is not merely a tomb, but a psychological labyrinth built to test the sanity of grave robbers. The architecture heavily features black obsidian, endless mirrors, and unnerving geometry that seems to loop back on itself. The Sanctum is designed to turn allies against one another through illusions and paranoia.

Environmental Hazards & Gimmicks

  • The Whispering Shadows: The shadows in this dungeon are semi-sentient. Characters standing in dim light or darkness hear whispers of their deepest regrets and fears. At the end of every hour spent in the dungeon, characters must make a DC 14 Wisdom saving throw or gain a level of "Paranoia" (functions identically to Exhaustion, but level 3 causes hallucinations instead of disadvantage on attacks).
  • Mirrored Halls: Many corridors are lined with perfect, unbreakable mirrors. Spells that require an attack roll have a 25% chance to reflect off the walls and target a random creature within 30 feet, including the caster.
  • Shifting Architecture: Doors frequently disappear once walked through. Retracing steps often leads to entirely new rooms.

Key Locations/Rooms

1. The Hall of Reflections

  • Description: A long, grand hallway constructed entirely of polished obsidian. The reflections are slightly delayed; a character might raise their arm, and their reflection will raise its arm a second later.
  • Sensory: The air is freezing cold. The sound of footsteps echoes unnaturally long.
  • Mechanic/Trap: As the party reaches the center of the hall, their reflections stop mirroring them. The reflections draw weapons and step out of the mirrors.
  • Monsters: Shadow Clones of the party. They have the same stats, AC, and basic attacks as the players, but only 1 HP. However, any damage dealt to a Shadow Clone is also dealt as psychic damage to the player it copies (DC 15 Wisdom save for half). The puzzle is to shatter the mirrors, not kill the clones.

2. The Chasm of False Faith

  • Description: A massive, bottomless gorge bisects the dungeon. There is no bridge. On the other side is a heavily ornate door.
  • Sensory: An updraft brings the smell of ancient dust and dry rot.
  • Mechanic: There is an invisible, solid bridge spanning the gap. However, it only exists if a character steps onto it while their eyes are completely closed. If a character opens their eyes or uses magical sight (like Truesight) while on the bridge, the bridge vanishes beneath them, dropping them into the chasm (a 100-foot fall to a lower level of the dungeon).

3. The Chamber of Paranoia

  • Description: A circular room with a high, domed ceiling. In the center is a pedestal holding a beautiful, jeweled chalice. The doors lock mechanically upon entering.
  • Mechanic/Trap: When the doors lock, a thick, sweet-smelling gas fills the room. This is a powerful hallucinogen.
    • The Illusion: The DM privately messages or tells each player that one of their allies has suddenly transformed into a horrific monster (e.g., a mind flayer, a demon) that is preparing to attack them.
    • The Reality: The party is just looking at each other. They must use Insight (DC 18) to realize it's an illusion, or they will begin fighting each other. The doors only unlock if 1 minute passes without any combat, or if the chalice is filled with a drop of willing blood.

4. The Ossuary Maze

  • Description: A labyrinth constructed entirely from neatly stacked bones and skulls. The layout shifts continuously.
  • Sensory: The crunch of bone dust underfoot.
  • Mechanic: Navigating the maze requires a skill challenge (Survival/Investigation). However, the skulls embedded in the walls constantly mutter curses.
  • Monsters: Several Minotaur Skeletons patrol the maze. If combat breaks out, the bone walls can collapse, burying players and restraining them under heavy debris.

5. The Throne of the Mad King (Boss Encounter)

  • Description: A vast, octagonal chamber. The walls are lined with statues of weeping angels. On a dais sits a throne of jagged black glass, occupied by the mummified remains of the Mad King.
  • The Boss: The Mad King, Oros (Use a Mummy Lord stat block with expanded spellcasting).
  • Boss Mechanics:
    • Lair Action (The Mirrors Lie): Oros summons four illusory duplicates of himself anywhere in the room. They perfectly mimic his movements and actions. Attacking an illusion destroys it but triggers a psychic backlash (2d6 psychic damage to the attacker).
    • The Weeping Angels: The statues on the walls are not mere decoration. If a player ends their turn without looking directly at one of the four statues (player facing matters), the statue moves 15 feet toward them. If a statue reaches a player, it makes an automatic grapple check; if successful, the player is Petrified until the statue is destroyed.
    • Gaze of Madness: Instead of a rotting glare, Oros's gaze forces a DC 16 Charisma save. On a failure, the player is charmed and commanded to use their most powerful attack against their nearest ally.
  • Loot: The King's crown, the Diadem of the Void (Grants resistance to psychic damage and immunity to the charmed and frightened conditions, but the wearer cannot see their own reflection).