Undermountain

Quick Reference

TypeProgenitor Sanctuary/Prison
LocationBeneath Waterdeep
GuardianIkarin
ContainsNegloshi Prison, Treasury, Awakening Sarcophagus

Geography & Atmosphere

This sanctuary defies the rough-hewn chaos of the natural caverns above, defined instead by the terrifying, mathematical perfection of Progenitor architecture. The walls are not built but seemingly grown from seamless, obsidian-like stone that curves in impossible, non-Euclidean geometries, dimly lit by veins of bioluminescent moss that have colonized ancient power conduits. Colossal statues of forgotten potentates line the central promenade, their features blurred by eons of silence but their stances radiating an imperious, divine authority. The air here is stale, recycled through millennia of isolation, yet it hums with a faint, subsonic vibration—the “heartbeat” of the facility—that rattles the teeth and weighs heavy on the soul, a constant reminder of the immense, dormant power pulsating beneath the floor.

Deeper within, the atmosphere fractures into two distinct extremes. The approach to the Negloshi prison radiates a palpable, psychic cold, a creeping dread that prickles the skin and whispers of contained madness and shapeless horrors waiting in the dark. In stark contrast, the Treasury beckons with the allure of forbidden knowledge, where the glint of strange, liquid metals and the soft pulse of stasis fields promise technologies that could reshape worlds. The entire sanctuary feels like a held breath, a suspended moment in history where the crushing weight of the mountain above is nothing compared to the gravity of the secrets buried within these flawless, silent halls.


Points of Interest

  • The Awakening Sarcophagus — Where Elric underwent his power awakening
  • The Treasury — Ancient Progenitor wealth and artifacts
  • The Negloshi Prison — Ancient shapeshifters imprisoned by Progenitors

Party’s Experiences

Session 3: Awakening

Ikarin brought Elric here after rescuing him from Firefly. Elric underwent the Awakening ritual in the sarcophagus, boosting his stats to 20+ and unlocking his bloodline abilities. He then raided the Treasury for gold and the Mithril Pocket Watch.


DM Notes

  • Contains the Negloshi prison — ancient shapeshifters
  • Ikarin is the guardian
  • “Ark of Creation” is connected to this place
  • Elric can teleport back here (visited)