The Unremembered Basin

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Medium Ooze, Neutral Evil

Armor Class 13 (natural armor)

Hit Points 52 (8d8+16)

Speed 20 ft. climb 20 ft.

STR 14 (+2)

DEX 16 (+3)

CON 14 (+2)

INT 8 (-1)

WIS 13 (+1)

CHA 15 (+2)

Saving Throws Wis +3

Skills Insight +3, Deception +4

Damage Resistances acid; cold; fire

Condition Immunities blinded, charmed, deafened, frightened, prone

Senses blindsight 30 ft., passive Perception 11

Languages Common, telepathy 60 ft.

Challenge 3 (700 XP) Proficiency Bonus +2

The Basin Remembers. The Unremembered Basin is immune to all damage dealt by a creature that does not understand what it used to be. Damage from a creature that knows the Basin was once the Mercy Basin of Bellwether, a sacred wishing fountain destroyed by a flood, affects it normally. A creature can use its action while within 30 feet of the Basin and able to see its surface to make a DC 14 Intelligence (History) or Wisdom (Insight) check. On a success, the creature recognizes the Basin's former identity and can harm it normally. A creature that has learned this truth can communicate it to others.

Amorphous Reflection. The Basin can move through a space as narrow as 1 inch wide without squeezing. It can climb difficult surfaces, including upside down on ceilings, without needing to make an ability check. Its surface perfectly reflects the world as it wishes it were, showing each viewer a place, person, or life they long for.

False Depths. A creature that starts its turn within 5 feet of the Basin and can see its surface must succeed on a DC 13 Wisdom saving throw or have its speed reduced to 0 until the start of its next turn as it reaches toward the reflected world. A creature that fails this save by 5 or more is also incapacitated until the start of its next turn.

Actions

Multiattack. The Basin makes two Reflective Lash attacks.

Reflective Lash. Melee weapon Attack: +5 to hit, reach 10 ft., one target. Hit: 7 (1d8+3) bludgeoning damage. The lash looks like the target's own hand reaching from a perfect version of the world. If the target is within 5 feet of the Basin, it must succeed on a DC 13 Strength saving throw or be pulled 5 feet toward the Basin.

Drown in the Better World (Recharge 5-6). The Basin projects a false landscape in a 15-foot cone. Each creature in that area must make a DC 13 Wisdom saving throw. On a failed save, a creature takes 3d6 psychic damage and is pulled up to 10 feet toward the Basin. On a successful save, it takes half as much damage and is not pulled. A creature reduced to 0 hit points by this effect vanishes beneath the Basin's surface, leaving behind only a faintly glowing reflection; it reappears in an unoccupied space within 5 feet of the Basin after 1 minute, alive but unconscious.

Open the Way. The Basin chooses one creature within 10 feet that is charmed by False Depths or has failed a saving throw against Drown in the Better World during the current turn. The target must succeed on a DC 13 Strength saving throw or become grappled and restrained as its arms and upper body sink beneath the reflective surface. The target repeats the saving throw at the end of each of its turns, ending both conditions on a success. While restrained this way, the target cannot breathe and takes 1d6 psychic damage at the start of each of its turns.

Reactions

Reflect the Blow. When a creature that does not understand the Basin's former identity misses it with an attack, the Basin causes the attack to strike the attacker's own reflection. The attacker must succeed on a DC 13 Wisdom saving throw or take 1d6 psychic damage and have disadvantage on its next attack roll before the end of its next turn.

Environment Urban, Forest, Swamp

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Reach farther. Your better life is only one handspan beneath the water. — inscription appearing in the puddle

Lore & Description

Appearance

The Unremembered Basin appears at first to be an ordinary puddle, no more than ten feet across. Its water is perfectly still and unnaturally clear, reflecting blue skies, unbroken homes, healthy forests, and the viewer standing in a life untouched by loss. Beneath the surface, pale shapes resembling reaching hands drift through impossible depths. When angered, the puddle rises in thin, glassy sheets, its edges forming the blurred outline of a stone fountain that no longer exists.

Behavior & Origins

The creature was once the Mercy Basin of Bellwether, a consecrated wishing fountain said to show petitioners the future they could build through kindness. When a flood destroyed Bellwether, grief, broken promises, and generations of desperate wishes gave the surviving water a predatory will. The Basin now lures travelers with visions of restored homes and dead loved ones, drowning anyone who tries to touch the reflection. The ruined village of Bellwether still contains a cracked inscription naming the fountain; learning and speaking that name allows a creature to harm the ooze. The Basin wants to find the lost silver coin of Bellwether's founder, believing that returning it to its depths will make its perfect world real.

Running The Unremembered Basin

Tactics

The Basin begins combat by displaying each opponent's greatest desire, using False Depths to freeze the most emotionally vulnerable target before unleashing Drown in the Better World. It pulls isolated creatures toward itself and uses Open the Way on anyone restrained near its center, while keeping obstacles between itself and creatures that have learned its history. Once bloodied, it abandons subtlety and tries to drown the creature carrying knowledge of its former identity; if that creature dies, the Basin fights to the death, but otherwise it flows through cracks and flees.

DM Tips

Telegraph the danger with reflections that show impossible details: a dead NPC alive, a burned building restored, or the viewer wearing a beloved heirloom they never owned.
Let players discover the solution through the name Mercy Basin of Bellwether, a cracked fountain plaque, an old villager's testimony, or a surviving silver wishing coin.
The Basin is not mindless; give it a soft, hopeful voice through ripples and reflected mouths, and have it become furious when called by its former name.
For a weaker party, reduce Drown in the Better World's damage to 2d6 and remove Open the Way's restrained condition; for a stronger party, increase the save DCs to 14 and give the Basin 10-foot blindsight beyond its normal range.

Loot

Founder’s Silver Wishing Coin — A tarnished silver coin hidden beneath the Basin's center. It bears Bellwether's original seal and can be used as proof of the creature's former identity or as a key to a sealed chamber beneath the ruined village.
Shard of Mercy Basin — A piece of blue-green fountain stone that reflects a person as they were before their greatest regret. It can serve as a focus for divination concerning lost places or broken promises.
Vial of Impossible Water — A small amount of the Basin's water that remains perfectly still even when shaken. Drinking it grants a beautiful vision of a desired future, but the drinker must succeed on a DC 13 Wisdom saving throw or be charmed for 1 hour.

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Generation Info

Original prompt:
"CR 3: A puddle that reflects a better world and drowns those who reach for it. It can only be truly harmed by someone who understands what it used to be."

Created: Sep 19, 2026
Modified: Oct 26, 2026

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