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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 Oasis Heart

Beneath the oasis, a dead star still drinks the desert.
Rooms
10
Foes
18, CR 1/2 to 9
Traps
8
Treasure
16,000 gp
12345678910Entrance
Select a room on the plan to open it.

The party is in

1. The Buried Threshold

Seen

Something wanders by

At a glance

The threat

The dungeon's deepest chamber contains Vael Turog's damaged miniature mythallar, now inhabited by the mage's fractured consciousness and linked to Nhalass, the buried oasis intelligence.

Wandering monsters (1d4)

  1. 1

    1 swarm× Oasis Scarab SwarmCR 2

    When: After loud combat or when a cooling pipe is brokenA pair of animated bronze scavengers with waterlogged wings and broken Netherese seals.
  2. 2

    Archive RevenantCR 3

    When: When memory crystals are removed from rooms 3 or 4A translucent prisoner spirit carrying a chain of glowing names, desperate to find its lost body.
  3. 3

    Spell-Sand HorrorCR 4

    When: When characters cross a corridor feature without stopping to investigateA crawling mass of black sand, crystal teeth, and leaking spell-gas.
  4. 4

    Runoff ElementalCR 2

    When: When the oasis conduit is disturbed or the dungeon begins collapsingA broken water elemental that repeats fragments of Vael's final command.

Rooms

10
1

The Buried Threshold

2 foestreasuresecret

What they see

Read aloud

A cracked stairwell descends from the abandoned mage tower into a circular receiving hall. Wind carries sand through the broken entrance, but warm water flows upward along the walls toward the oasis above.

Features

  • Collapsed tower masonry forms partial cover.
  • A dry fountain bears Vael Turog's sigil.
  • A sealed iron door leads deeper into the dungeon.

What the GM knows

Monsters

2× Netherese Scarab CustodianCR 1/2

Animated bronze custodians shaped like kneeling scarabs, their bodies etched with faded maintenance runes.Tactics. They attempt to separate intruders, shove them toward the fountain, and sound a silent alarm if reduced below half hit points.

Treasure

Cooling Warden Token150 gpmagical

A bronze maintenance token stamped with Vael's seal. It grants advantage on checks to operate old Netherese machinery.
Room secrets · GM only

Notes

The custodians ignore anyone carrying a Netherese arcane focus, but they demand a maintenance phrase in ancient Netherese. Failure causes the iron door to lock for 10 minutes.

3 doors: E (normal), N (archway), S (archway)

The place

What it is

Beneath an abandoned Netherese mage tower lies a sealed system of prisons, archives, and arcane cooling chambers.

Atmosphere

The dungeon is hot, damp, and unnaturally alive.

The threat

The dungeon's deepest chamber contains Vael Turog's damaged miniature mythallar, now inhabited by the mage's fractured consciousness and linked to Nhalass, the buried oasis intelligence.

History

The tower was raised by Vael Turog, a Netherese hydromancer who sought to create a permanent oasis in Anauroch.

Rumors

1d5
Roll a rumor

  1. 1The oasis keeper says the water has begun flowing uphill at night, carrying voices from beneath the sand.
  2. 2Caravaners claim the abandoned tower shines blue whenever someone dies in the desert.
  3. 3A relic hunter insists the mage tower hides a star that can make water from empty air.
  4. 4Old guides warn that the tower's basement has no bottom, only doors that remember where you have been.
  5. 5A blind storyteller says the oasis is sleeping, and every spell cast near it makes the dream worse.

Plot hooks

4
InvestigationThe Dying OasisThe oasis has begun shrinking despite recent rains, and villagers report hearing a voice beneath their wells promising them a city of blue glass.From: Samira Qadir, the oasis keeperReward: A restored water supply, a map to Netherese ruins, and a pearl worth 500 gp
RecoveryEchoes in GlassA scholar hires the party to recover memory crystals from the prison archive before a rival expedition reaches the tower.From: Professor Hadran Vell, a desperate Netherese historianReward: A rare spellbook, expert translation of Netherese relics, and 1,000 gp
RescueThe Prisoner Beneath the WaterThe party is asked to rescue a bound elemental whose spirit has been heard in the oasis winds for three nights.From: Ilyra Sandstep, a genasi caravan guideReward: A bound air elemental ally and a charm granting resistance to desert heat
Moral ChoiceThe Choice Beneath the Falling StarA faction of relic hunters wants the mythallar stabilized and claimed, while the oasis keepers insist it must be destroyed.From: Rusk of the Ashen CompassReward: A share of recovered Netherese treasure or a powerful favor from the oasis community

Corridors

4

  • Between rooms 1 and 3

    Thin streams of warm water run through carved channels, occasionally reversing uphill for several seconds before settling again.

  • Near rooms 3 and 4

    Faded Netherese warning glyphs appear beneath layers of mineral scale. When touched, they whisper fragments of a forgotten evacuation order.

  • Between rooms 5 and 7

    Glassy patches in the floor show brief visions of sandstorms, drowning chambers, and a black star falling through blue fire.

  • Near rooms 8 and 9

    The stone walls sweat luminous droplets that evaporate into poisonous spell-gas when disturbed.

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