ConquerorThe Dungeon of Warden Vhaeloth
The fungus links every cell to the jailer's ear, and still you whisper.

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Spore Network. Vhaeloth is connected via fungal threads to every wall, floor, and tunnel within 500 ft. of his cell. He automatically knows the location of any creature moving within that range and cannot be surprised by it.
Thought Whisper. Vhaeloth can communicate telepathically with any creature within 60 ft. that understands a language, and can make sounds echo from his spore network as though he were standing at that location.
Regeneration. Vhaeloth regains 10 hit points at the start of his turn if he has at least 1 hit point and is in contact with fungus or stone.
Multiattack. Vhaeloth attacks twice with his spore claws.
Spore Claws. Melee Weapon Attack: +6, reach 5 ft., one target. Hit: 12 (2d8+3) slashing damage.
Choking Spore Cloud (Recharge 5-6). Vhaeloth spews a cloud of spores in a 20-foot radius. Each creature in that area must make a DC 15 Constitution saving throw: on a failure, the creature is dazed and weakened (disadvantage on attack rolls) until the end of its next turn and takes 14 (4d6) poison damage; on a success, it takes half the damage and is not dazed.
The Story
You wake on cold obsidian, deep beneath the world, in a dungeon carved from living rock and lit by violet crystals. Four hundred prisoners wait here for the slave market, and in two days it is your turn. There is one way up, and only the dead know it.
The real problem glows along the walls: a bioluminescent fungus that links every cell to the jailer's chamber. Every whisper, every footstep, every plan is carried to a blind warden who hears all and forgives nothing. A fellow prisoner managed to smuggle a note to the surface, and it cost him his tongue.
You must deceive the fungus or snuff it out, win keys and favors from the other prisoners, and piece together a route upward through mine shafts no one has crossed alive. Every noise draws Jailer Vhaeloth closer, and betrayal waits among those who would buy their own freedom with yours.
The breakout builds to a reckoning with Jailer Vhaeloth, the Spore-Listener, fused with the fungus he fed to prisoners for years. Blind and smiling, he hears your heartbeat through the spores in the air, and your plan before you even whisper it. Succeed, and four hundred souls go free; fail, and your voice becomes the next one the walls whisper to him.
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