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This is the under dungeon located on the basement of an old abandoned mage tower in Netheril. The tower is now in de desert of Anauroch in one oasis · Medium · Medium

The Unfinished Suns

The apprentices stored sunlight in water, but something beneath the cistern learned to drink it.
Rooms
9
Foes
10, CR 1/2 to 6
Traps
5
Treasure
5,175 gp
123456789Entrance
Select a room on the plan to open it.

The party is in

1. Buried Entry

Seen

Something wanders by

At a glance

The threat

A failed Netherese purification intelligence called the Black Current has awakened beneath the complex.

Wandering monsters (1d4)

  1. 1

    1d4× Arcane-Scarred JackalCR 1

    When: The party makes a loud noise, spills water, or rests in an unguarded corridor.A jackal warped by arcane residue follows the smell of blood and contaminated water.
  2. 2

    Rogue Maintenance ServitorCR 2

    When: A ward-stone activates or the party removes a magical object from a wall.A damaged bronze servitor drags one broken leg and repeats fragments of maintenance instructions.
  3. 3

    Black Current OozeCR 3

    When: The party crosses a flooded channel or disturbs crystal growth.A translucent sheet of contaminated water flows along the floor, carrying scraps of parchment and tiny glowing fish.
  4. 4

    1d3× Drifting Ward ClusterCR 2

    When: A gravity inversion occurs in rooms 3 or 8.A cluster of floating stones forms a crude guardian when gravity shifts, then attacks anything not bearing an apprentice sigil.

Rooms

9
1

Buried Entry

1 foetreasuresecret

What they see

Read aloud

A cracked stairway descends from the abandoned tower's basement into a circular chamber filled with sand, fallen stone, and the faint sound of running water. A broken archway ahead bears the same sunburst emblem found on the tower's exterior.

Features

  • Collapsed stair behind the party
  • Sand-filled drainage grates
  • Faded Netherese warning glyphs
  • A bronze door leading east toward the main corridor

What the GM knows

Monsters

Arcane-Scarred JackalCR 1/2

A desiccated desert scavenger has been warped by the dungeon's leaking magic and now nests among the sand.Tactics. It hides beneath the sand, attacks the weakest-looking target, and flees through the drainage grates when reduced below half its hit points.

Treasure

Purity Flask75 gpmagical

A sealed apprentice's water flask still contains enough clean water for one day and bears a minor ward against contamination.
Room secrets · GM only

Notes

This entrance lies directly below the Sandglass Vestibule. Characters can hear intermittent metal impacts from room 2 and running water from room 8.

4 doors: E (normal), W (locked), N (locked), S (secret)

The place

What it is

Beneath an abandoned Netherese mage tower lies a buried complex of cisterns, spell-storage vaults, and apprentice workrooms.

Atmosphere

Cool, mineral-rich air drifts through the buried halls, carrying the smell of wet stone, old copper, and desert dust.

The threat

A failed Netherese purification intelligence called the Black Current has awakened beneath the complex.

History

The tower's under-dungeon was constructed by Netherese arcanists to train apprentices in water purification, ward maintenance, and the preservation of minor spells.

Rumors

1d5
Roll a rumor

  1. 1The abandoned tower still has a clean well beneath it, but anyone who drinks from the water dreams of falling upward.
  2. 2Netherese apprentices once kept a library under the tower, and its books were sealed in glass jars.
  3. 3A stone guardian patrols the lower halls and asks every traveler for the name of their master.
  4. 4The oasis grew around the tower because a spell beneath it was designed to make water from sunlight.
  5. 5A masked relic hunter entered the tower last month and returned speaking with a second voice.

Plot hooks

4
InvestigationThe Sickening OasisA caravan's water turned violet after camping near the oasis, and three travelers vanished beneath the tower. The party is asked to find the missing people before the oasis becomes unusable.From: Sarra Venn, a caravan master with a cracked purification flaskReward: A desert map showing hidden wells, 250 gp, and a permanent favor from local caravans
RecoveryThe Apprentice's RecordA Netherese spell tablet recovered from the sand identifies the tower as the source of a lost water-shaping ritual. An arcanist wants the tablet retrieved from the under-dungeon before rival explorers arrive.From: Magister Othrel, an anxious scholar from a distant enclaveReward: A translated water-shaping ritual and one uncommon spell scroll
Monster HuntThe Price of Clean WaterThe party is hired to destroy the drowned spell-eater, but its death may release the Black Current into the oasis. They must decide whether to seal, redirect, or purge the ancient system.From: Ilyra Dustcloak, a priest of a desert water cultReward: Blessing of abundant water, safe passage through Anauroch, and a jeweled relic worth 400 gp
Ancient RelicThe Reservoir KeyA hidden passage leads toward a sealed reservoir containing a Netherese artifact that several factions believe can restore a lost flying citadel. Opening it may awaken the third entity below.From: Khevran Sable, a masked relic brokerReward: A share of the artifact's value, or a dangerous Netherese focus suitable for a high-level ritual

Corridors

4

  • Main corridor between the Sandglass Vestibule and the Servitor Gallery

    Thin channels cut into the floor carry oasis water toward ancient cisterns. Several are clogged with gray crystal growth that crackles when stepped on.

  • Central route outside rooms 3, 5, and 6

    Failing ward-stones protrude from the walls like pale teeth. At irregular intervals they animate a nearby statue, unleash a force pulse, or briefly reverse gravity.

  • Side passages near the maintenance rooms

    Bronze inspection plates bear apprentice sigils and faded instructions for testing water purity and stabilizing stored spells.

  • Gallery approach to room 8

    A shallow flooded channel descends toward the lower levels. The water occasionally glows violet when something moves beneath it.

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