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The Reflected Moon Basin - AI-generated fantasy Hazard

The Reflected Moon Basin

The Reflected Moon Basin is a magical ward designed to halt intruders without spilling blood. It projects pale moonlight onto creatures that disturb its water, causing their shadows to pull away from them and drag at their limbs. The effect is unsettling rather than immediately destructive, but prolonged exposure leaves victims exhausted, disoriented, and vulnerable to whatever guards the passage beyond.

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Hazard EntryMagical wardLevel4Simple

The Reflected Moon Basin

4LevelUncommonRarityAncient crypts, forgotten temples, sealed lunar observatories, and underground passages near still waterEnvironment
MagicalMechanicalWardPsychic
Level4
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HPThe basin has 20 hit points and immunity to psychic and poison damage. Destroying it ends the hazard, but doing so causes one final burst of moonlight. Creatures within 15 feet must make the trigger's saving throw or suffer the trigger's effects.
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AC15
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TypeMagical ward
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ComplexitySimple
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RarityUncommon

Defenses

AC15
HardNot applicable to D&D 5E
HPThe basin has 20 hit points and immunity to psychic and poison damage. Destroying it ends the hazard, but doing so causes one final burst of moonlight. Creatures within 15 feet must make the trigger's saving throw or suffer the trigger's effects.
BT Not applicable to D&D 5E
Fort+Not applicable to D&D 5E
Ref+Not applicable to D&D 5E
Will+Not applicable to D&D 5E
Immune
Poison damage, Psychic damage, Charmed, Frightened
Resist
Bludgeoning, piercing, and slashing damage from nonmagical attacks
Weak
The hazard is suppressed while the basin is completely covered., The silver reeds are vulnerable to fire damage and can be destroyed by dealing 10 fire damage to them., Radiant damage dealt directly to the moon sigil has advantage., The hazard cannot affect creatures that have no shadow, at the DM's discretion.
MagicalMechanicalWardPsychic

Detection

PerDC 13 Wisdom (Perception) to notice the unnatural stillness of the water and the silver reeds. DC 14 Intelligence (Investigation) to identify the basin as a deliberate magical ward.
StlThe hazard is not hidden, but its magical nature is subtle. It has advantage on checks made to remain unnoticed as a magical ward.
InitThe hazard acts on initiative count 10 after it is triggered.

“A shallow stone basin sits in the center of a passage, filled with perfectly clear water. Silver reeds grow from cracks around its rim, though the surrounding stone is dry and dusty. A faint reflection of a moon appears on the water even in complete darkness.”

Standard Engagement

Trigger

The hazard triggers when a creature touches the water, steps into the basin, or disturbs more than one silver reed. It also triggers if a creature attempts to move the basin without first disabling the moon sigil.

Routine

On initiative count 10, the basin's moonlight pulses. Each creature currently within the 15-foot-radius area must repeat the DC 14 Wisdom saving throw. A creature that fails takes 3 (1d6) psychic damage. If it fails by 5 or more, it is also restrained by its shadow until the end of its next turn. The pulse continues for 3 rounds, after which the magic fades.

Reset

The hazard resets 1 minute after its light fades, provided the basin remains intact and the silver reeds are not disabled.

Shadow-Tethering Moonlight

When triggered, the basin emits pale light in a 15-foot-radius sphere. Each creature in the area that can see the basin must make a DC 14 Wisdom saving throw. On a failed save, a creature takes 7 (2d6) psychic damage and is restrained by its own shadow until the end of its next turn. On a successful save, it takes half damage and is not restrained.

Dragged Shadow

At the start of each restrained creature's turn, it must repeat the DC 14 Wisdom saving throw. On a failure, it takes 3 (1d6) psychic damage. On a success, the restraint ends for that creature. A creature can also end the restraint early by using an action to make a DC 14 Strength (Athletics) check.

Unnatural Moonlight

The basin's light is magical dim light. A creature that is blinded, has its eyes closed, or cannot see the basin has advantage on saving throws against the hazard, but it still triggers the hazard by touching the water or basin.

Shared Struggle

A creature restrained by its shadow casts a shadow in the direction of the basin, regardless of the surrounding light. Other creatures can recognize the restraint and help by using an action to pull the victim away, granting the victim advantage on its next Strength (Athletics) check to escape.

Covered Reflection

If the basin is covered completely before it is triggered, the hazard cannot activate. If covered after activation, its radius shrinks to 5 feet, and creatures outside that radius are no longer affected by new pulses.

Description

The Reflected Moon Basin is a magical ward designed to halt intruders without spilling blood. It projects pale moonlight onto creatures that disturb its water, causing their shadows to pull away from them and drag at their limbs. The effect is unsettling rather than immediately destructive, but prolonged exposure leaves victims exhausted, disoriented, and vulnerable to whatever guards the passage beyond.

Discovery

The basin's water never ripples naturally, and its moon reflection remains fixed when viewed from different angles. A DC 13 Wisdom (Perception) check notices that nearby dust stops in a perfect circle around the basin. A DC 14 Intelligence (Investigation) check reveals shallow footprints that approach the basin but never continue beyond it.

Archival Lore

“The Quiet Choir believed that a person's shadow remembered every betrayal committed in life. Their burial wards were built to make intruders confront that shadow before entering a sacred chamber. The basin's magic grows stronger near moonlight, but it can also be fooled by a covered surface that prevents the reflected moon from appearing.”

Environment
Ancient crypts, forgotten temples, sealed lunar observatories, and underground passages near still water
Theme
Moonlight, guilt, funerary magic, and shadows that remember
Creator
A moon-worshiping funerary order known as the Quiet Choir
Purpose
To restrain and disorient intruders before they reach a protected crypt or ceremonial chamber
Game System
D&D 5E
Art Style
Dark fantasy environmental concept art, ancient dungeon corridor, moonlit magical water basin, silver reeds, subtle supernatural unease, rich stone textures, cinematic lighting
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