The Test of Still Waters

(or, the Hydrology of the Cistern Fiend)

“Kneel, and listen. You have spilled blood beneath the moons. Now you must learn the lesson of water, as decreed by our King of Storm and Stars.”

“There exists, in the far oases and half-dead wells of Athas, a being not born of the elements, but still worthy of reverence - if only as a rival. The ignorant call it ‘the water worm.’ I name it rightly: the Cistern Fiend; Sovereign of Thirst, the Devourer-That-Gives.”

“It was not made by our Lord, no. But it fulfills His design. It lives by law. It kills by law. And most importantly, it maintains order in the waters where no templar walks. It slays the impure and purifies what remains. This is sacred labor, even if done by a beast.”

“The fiend is vast. Serpentine. Its skin is a shifting film of shadow and light. Though it has eyes, it does not need them; it sees with thought, hears without sound. Its tentacles paralyze. Its mouth drains the living until they are dry as sun-cured hide. Then, it filters their essence, cleanses it, and releases it back into the water for others to drink.”

“Yes, acolyte - what the fiend kills, it turns to life. What it devours, it returns as a gift. The lesson is clear: sacrifice is purification. It is so in Draj. It is so in the desert.”

“Its heart is not flesh, but sponge - layered, living, sacred. A temple within its body, where water is reborn through suffering. This ‘sponge-heart’ draws in poison, rot, and waste, and filters it with humors and psionic pulse. A mockery of a true wellspring, but one that works.”

“And lo - when the time of stillness comes, when no ripple mars the pool, when no bird drinks, you have arrived at the Calm Time. A warning, cloaked in peace. The fiend births its young, deep within its heart, and for a few sacred days, it is still. Like our Lord before battle. Like a blade before the cut.”

“Disturb it during this time, and the fiend wakes in fury. The parent may crush its young or drive them out too soon - some emerge twisted, some rot and poison the pool, and others cling within, draining the parent until both decay.”

“Its spawn are born as soft, translucent leeches called sponge crawlers. Harmless, until they are not. They grow into fiends themselves, if allowed, but no two may share a pool, just as no two kings can share a city. One must flee or die, as is proper.”

“With time - perhaps centuries - the fiend ceases to stir. Its flesh hardens, its colors fade. Algae veils its form, and mineral crust seals it into the stone itself. It becomes a Stone-Bellied One. Dormant, dreaming, and yet still purifying its waters. Many drink from such pools, never knowing the thirst-king below.”

“And what does it cast out? The cistern stones. Hardened impurity. Compact jewels of bile and decay. Traders covet them. Water-priests grind them. But they are dangerous. They remember what they once filtered. Some say a broken stone wakes the spirit still choking inside it. I say: break one only if you thirst for madness.”

“Within its body, too, dwell filter eels: tiny, clear parasites that feed on the filth in its heart. These may be harvested. Turned into medicine. Or into poison. A bard who knows the eel’s last meal may make a cure of it. Or a weapon.”

“Understand this, and you understand the will of Tectuktitlay: the cistern fiend is not your friend. Nor your foe. It is a test. It is the stillness that waits to punish the foolish. It is the mouth that speaks only when you bleed into it. And like all such forces, it can be respected or bound.”

“Drink, then, acolyte. But not without offering. Cut your palm, let the blood fall first. That is how the wells of Draj have always been sweet.”

– Spoken in the Temple of Two Moons in Draj by Tezozomoc, August Moon Priest of Glorious Tectuktitlay

————

Addenda to the Hydrology

Across Athas, the creature called the cistern fiend bears a multitude of names - each shaped by fear, necessity, and the meanings a people give to water. In those titles lie mirrors of culture and survival: from reverence to revulsion, every name reveals how the living explain thirst’s endless, watching hunger.

Balicans often call the creature the “oasis taxman” when someone vanishes near a pool; it is a bitter street joke, as if some invisible collector came in the night. The slang “the Governor’s Tax” compares the fiend’s thirst for blood to Andropinis’s greedy bureaucracy - both drain what others have stored, without asking.

Draji Moon Priests name the fiend Atl Cecemiliztli Tlatenquiztli, the “Test of Still Waters.” If a cistern fiend kills, they claim the water was judging purity: those who drink and live were worthy, those who die simply paid a debt.

In Gulg, the monster is N’gol Mbatha, “Throat of the Earth-Mother’s Shame.” Spirit-talkers say a shameful devouring spirit sits in a hidden throat that links all underground waters, stealing offerings meant for the Oba.

Nibenese templars mark dangerous wells as “Whispering Cisterns,” officially meaning “unreliable water.” The phrase also hints at hidden power or sedition: a place where something unseen eats away at safety, whether worm or conspirator.

In Raam, the fiend is “the Eye Below” or sometimes “Nishra’s Gaze.” Alley cults say it is a buried eye watching those who waste water, so they throw in bits of glass or ceramics “to make the eye blink,” even if they secretly doubt any higher being still cares.

Urikite workers grumble about the “King’s Sponge,” a nickname for anything that “drains you hollow and leaves you standing,” from taxes to cruel officers. In proclamations, templars prefer “the King’s Filter,” claiming that any oasis “filtered by worm or man” now rightly belongs to Hamanu.

Tyrans simply say “Well Demon.” The term points both to real lairs beneath city wells and to human monsters - water-sellers or landlords - who charge so much that drinking feels like bargaining with something at the bottom.

In slave and gutter slang, the monster is “Dry-Master.” The name began as simply describing the fiend beneath the well, but quickly became a term for taskmasters and overseers who dry you to the bone and send you back to work, and now appears in rough songs and whispered curses.

Among thri-kreen, elders teach the proverb “Water that hunts is not water,” using the term sedtik’ha•sed, “Drinker-of-Stillness.” Young kreen learn never to trust perfectly still water that animals avoid, and some seers study the fiend as a model of patience and timing.

Forest Ridge halflings call it Gura-mek, “pool that remembers.” They believe every creature drunk by such a pool is kept as a spirit inside it, so they bury their dead near running streams to keep them out of the Gura-mek’s memory.

Dwarven miners call the creature “Focus-Drowner” when a flooded gallery or treacherous cistern steals a whole crew and the life-tasks they swore to finish. On old shaft-stones they also mark Gormbakhal “Sunless Throat” - a hidden vertical pocket where water and death wait together in the dark, and where, they say, the worm listens to each falling drop like a counting-stone.

Aarakocra scouts warn their flocks about “Dead-Thermals” - pools where the air above does not rise, where wings feel heavy and something below is waiting. For teaching fledglings, elders use the softer name “Broken-Wing Water” - any still pool where a careless flyer might drink once, slip, and never take the sky again.

Elves of the wastes call the cistern fiend Bo’kaan’ot, or the “false-water beast,” a reminder that the true trap is the promise of still, clean water where none should be. More cautious speakers name the pool itself Bo’naal’tuh, “feared, treasured water,” a place where danger guards the supply so that only those who move quickly, drink without waste, and show respect to the unseen may leave it alive.

Bo’naal’tuh kom. uu duk’ra, ahh, go— lo’ni bo’kaan’ot ahh.
(This is bo’naal’tuh. Run like the wind, drink, and go - or else bo’kaan’ot is the one who drinks.)

The creature under the water is always the same: all-seeing, patient, and hungry. But the names around it - be it taxman, test, shame, eye, sponge, guardian, or false water - show how every people on Athas tells their own story about the same fear: trusting still water more than one should.

—

Observation of the cistern fiend’s Calm Time led members of the Order to develop the power known as Stillpoint, which reproduces the creature’s controlled suspension of life processes. Through this manifestation, a psion can enter the same state of metabolic and mental equilibrium, remaining stable and self-contained for extended periods.

Stillpoint

Psychometabolism [Mind-Affecting]
Level: Psion/Wilder 6
Display: Mental (faint internal resonance hum)
Manifesting Time: 1 standard action
Range: Personal
Target: You
Duration: 10 minutes/level (D)
Power Points: 11
Saving Throw: None
Power Resistance: No

You still the currents of your body and mind until only balance remains - no breath wasted, no thought unspent. You become like the cistern fiend during its Calm Time, a living filter that neither acts nor decays.

While under the effects of stillpoint, your physiology and metabolism enter perfect equilibrium:

• You gain damage reduction 5/— and immunity to drowning, poison and disease. You also gain a +4 bonus on saving throws against exhaustion, fatigue, stunning, and ability damage.
• You need not breathe, eat, or drink for the duration. Nor do you excrete waste, bleed, or perspire.
• You cannot run, charge or make attacks. Manifesting an offensive power or taking any action that directly harms another creature ends this power immediately. If you remain completely motionless for 1 minute while this power persists, you radiate a tranquil aura in a 20-foot radius. Within this field, natural water is cleansed of impurities at a rate of 1 gallon per round (as purify food and drink). Creatures entering the aura must succeed on a Will save (DC 16 + your key ability modifier) or be affected as if by calm emotions while inside. This is a mind-affecting, supernatural effect.

Augment:
For every 2 additional power points you spend, increase your damage reduction by 1 (maximum DR 10/—).
For every 2 additional power points you spend, increase the aura’s radius by 5 feet.

Cistern Stones

Occasionally, a cistern fiend expels a dense mineral mass formed deep within its filtration organs. These rare spheres, known as cistern stones, surface only where a fiend has dwelled in a water source for many years and are prized by those who work with elemental Water magic.

A cistern stone is a dense, roughly spherical mass of hardened mineral and inert biological waste expelled by a cistern fiend during its purging cycle. These stones are usually dark gray to black, and often warm to the touch. Some carry strange inclusions - mineralized bits of organic tissue, bone fragments, or metal traces - caught in the cistern fiend’s filtration organs for years.

Mounting such a stone in a palm bracelet (Athasian Emporium) causes any spell with the Water descriptor cast by the wearer to have the save DC against it increased by +2. If no saving throw applies or is allowed, it instead adds +2 to the effective caster level of the effect.
Cost: 2,000 cp

Plot Hooks & Lore

• A trader seeks a cistern stone from a legendary fiend whose waters have kept a village alive for generations - but harvesting it might injure the cistern fiend and reduce its ability to cleanse the village’s waters.
• A Water cleric needs a perfectly formed cistern stone to create a powerful item, requiring one purged naturally and harvested immediately.
• A bard is searching for a pure black cistern stone - he plans to use it to craft a poison so pure that it can corrupt even blessed elemental Water.