Yijing 808 of the Abyssal Tide Pool

Lore: In the deep, water-based civilizations that rest beneath the waves of Saṃsāra, the current of the ocean is seen as the physical manifestation of the “Changing Lines.” The Yijing 808 was first fashioned by the Pearl-Seers of the Shallows, who noticed that the way water swirls within a tide-pool often mimics the hexagrams of the ancient Book of Changes. This item consists of a large, hollowed-out conch shell lined with iridescent abalone, containing a perpetually swirling miniature whirlpool of magically suspended seawater. It allows an aquatic avatar to read the “intent” of the tides and the creatures that dwell within them.

Stats

Tier: 1
Rarity: Common
Armor Check (AC): 1 (Limited to 3 per level)
Resilience: 12
Item HP: 32 (Avatar Max HP + 12)
Weight: 1 lb (Weightless in water)
Slot: Hand Slot (Held)

Passive Magic

The Joyous Lake (Tui): While held underwater, the avatar gains a +10% bonus to all Skill Checks related to navigating underwater terrain or identifying aquatic flora. The Mind’s Eye perceives the correct path as a series of glowing blue trigrams.
The Abyssal Water (Kan): The avatar can breathe normally in both saltwater and freshwater while the shell is held. Additionally, the shell acts as a passive sonar, allowing the avatar to perceive the location of large objects within 30 feet in dark or murky water (processed as Blind Sight in shades of gray).

Activable Magic

Casting the Yarrow-Reeds (Normal Chant): By speaking the “Trigram of the Wind over Water,” the avatar causes the water inside the shell to freeze into a specific hexagram. This grants the avatar Advantage on their next Attack Roll or Saving Throw made within the next minute, as they foresee the immediate “ebb” of the foe’s movement.
Tidal Revelation (Ritual Chant): By singing into the shell for more than 6 seconds, the avatar performs an Identify action on any submerged object or creature touched by the shell’s water. This reveals the target’s current Hit Points, Tier, and any Bound status. This draws significant attention as the shell emits a loud, rhythmic pulsing sound.

Specific Slot

Hand Slot: Must be held as a focus/conduit to function.

Acquisition of the Yijing 808 of the Abyssal Tide-Pool

In the world of Saṃsāra, obtaining a Yijing 808 often requires a journey to the underwater habitats or coastal shelf-cities where the Pearl-Seers maintain their workshops. These items are frequently discovered by divers exploring sunken monarchies or abandoned floating islands where the “Tidal Revelation” magic has preserved them in silt. Because the shell is a “Sentient-adjacent” artifact, it is sometimes gifted by elder aquatic gestalts to new Tier 1 avatars who have successfully possessed a marine creature and require a conduit to navigate the complex currents of their new existence.

Coastal Scavenger Hubs and Tide-Pool Markets

Located in the “Unsafe” or “Normal” transition zones between the land and the deep sea, these markets deal in the raw materials of the ocean. Trade here is tactile and often involves the “Buyer Beware” philosophy.

Buying: A scavenger or independent diver will sell a weathered but functional Yijing 808 for approximately 110 to 130 Silver. The price may be lower if the abalone lining is chipped, affecting its “Resilience” but not its primary magic.
Selling: A local trader will offer roughly 55 Silver, often arguing that the “Sonar” calibration is off or that the salt-crust on the exterior requires an expensive alchemical cleaning.

Underwater Grotto Boutiques and Artisan Shallows

In “Somewhat Safe” walled underwater habitats, specialized shops cater to the possessed population. These shops are managed by Tier 2 or Tier 3 artisans who understand the “Mechanical Power Transmission” of magical thought through aquatic focal points.

Buying: A pristine, calibrated Yijing 808 costs between 150 and 180 Silver (1.5 to 1.8 Gold). This higher price reflects the added “Resilience” and the guarantee that the internal whirlpool will not evaporate in dry “Safe Areas.”
Selling: These boutiques are selective. They may offer 80 Silver or a trade-in value toward a Tier 2 item, provided the avatar is ready to level up and has the required 6 attuned Tier 1 items.

The Faction Commissaries of the Pearl-Seers

For avatars who have joined an aquatic union or worker’s guild, the faction storage provides a more standardized economy. Access requires a faction badge and the standard 1 Gold per week membership fee.

Buying: Members can purchase the item at a “Faction Baseline” of 100 Silver (1 Gold). This is the recognized manufacturing cost among the island nations for a Tier 1 divination tool.
Selling: The commissary usually offers credit rather than coin, granting 10 to 15 Renown Points. This reflects the avatar’s contribution to the faction’s “Social Influence” and reputation within the realm.

The Maritime World Bank Exchange

In major port cities, the World Bank handles the “World Economic Baseline” for high-volume trade. They occasionally facilitate the sale of confiscated gear from ships that failed to pay their monarchy-mandated taxes.

Acquisition: The Bank sells these items in “Liquidation Bundles.” A “Seafarer’s Utility Kit” containing a Yijing 808, a waterproof standard backpack, and 10 days of aquatic rations might be auctioned for a starting bid of 200 Silver. Individually, the Bank values the shell at a fixed “Exchange Rate” of 140 Silver.

Strategic Application of the Yijing 808 of the Abyssal Tide-Pool

In the fluid world of Saṃsāra, where magic ebbs and flows like the tides, the Yijing 808 serves as both a literal and metaphorical anchor for an aquatic avatar. Whether navigating the high-pressure “Deathly Areas” of the deep trenches or the “Safe Areas” of a coral metropolis, the roleplay of this item centers on the avatar’s connection to the hydrostatic forces of the ocean.

Defensive Roleplay and Utility

In Designated Safe Areas like an underwater palace or a guarded grotto, the shell is used to maintain social and physical boundaries.

Roleplay: The avatar holds the conch to their “Earring Slot” or “Antennae,” listening to the “Joyous Lake” vibrations. By identifying the “stats” of incoming guests or the structural integrity of the grotto walls, the avatar ensures no hidden “Wild Magic” or structural cracks threaten the sanctuary. Since AC is tripled here, the shell’s presence acts as a deterrent, its iridescent glow signaling that the user is “Attuned” and alert.
Environmental Advantage: In the “Somewhat Safe” walled cities, the shell is used to navigate the complex “Mechanical Power Transmission” systems of steam-powered gates. The avatar roleplays the “Abyssal Water” passive to “ping” the internal gears and shafts, ensuring the passage is clear before the massive stone doors cycle.

In Unsafe or Deathly Areas, such as the midnight zone where light does not reach, the shell is the avatar’s primary survival tool.

Roleplay: In a “Deathly Area” where AC is cut to zero and every attack hits, the avatar relies entirely on the Blind Sight sonar. They roleplay the rhythmic pulsing of the shell, describing how the “shades of gray” echoes reveal the jagged silhouettes of predatory krakens or shifting volcanic vents. Defense here is not about absorbing a blow, but about using the “Tidal Revelation” to stay outside the reach of the foe’s movement.

Offensive Roleplay and Combat

When the drums of war sound and the game enters turn-based mode, the Yijing 808 becomes a conduit for tactical foresight.

Targeted Item Offense: An attacker may announce they are targeting a foe’s weapon or armor. The aquatic avatar roleplays peering into the swirling whirlpool of the shell to find the “Changing Line” that represents the foe’s weakness. They might shout the “Trigram of the Abyssal Water” as they direct a strike toward a foe’s breathing apparatus or magic focus, aiming to “deactivate” it and force a 10-minute ritual re-attunement.
Tier Die and Proximity: If the avatar is within 100 yards of the party, they roll their d20 plus the d4 Tier Die. The roleplay emphasizes the “Casting the Yarrow-Reeds” ability; the avatar foresees the foe’s path through the water. “The tide predicts your strike is too slow,” the avatar might hiss as they use the result of their Tier Die to ensure their attack exceeds the defender’s total AC.

Roleplay in Magic Storms and Aquatic Gestalts

In regions of Wild Magic, the underwater currents can become hyper-conductive and unpredictable.

Roleplay: The avatar describes the water inside the shell spinning at a “Nearly Impossible” speed, threatening to shatter the conch. They must use the “Power of Thought” to stabilize the focus. If part of a Gestalt (a swarm of smaller organisms), the roleplay involves the entire group mind vibrating in unison with the shell’s frequency to prevent “Wild Magic” from tearing the swarm apart.
Mana Boost Synergy: As a reaction to a lethal blow, the avatar roleplays expending a point of Mana Boost, describing the “Silver Fire” erupting from the shell to form a brief hydrostatic shield, leaving the avatar with 1 HP instead of death and the loss of their physical vessel.

Perception of Activation:

User’s Perspective

Visual: The avatar’s vision desaturates as the world’s colors bleed into shades of shimmering cerulean and deep indigo. The interior of the shell pulses with a rhythm that matches the avatar’s heartbeat, projecting translucent blue hexagrams into the air that float like bioluminescent plankton.
Auditory: A profound, omnidirectional silence falls, broken only by the “singing” of the shell. The user hears the distant, haunting melodies of the deep ocean—whale songs and the shifting of tectonic plates—which translate into the “intent” of the water.
Tactile: A localized sensation of “weightlessness” occurs in the hand holding the shell, as if gravity has been replaced by neutral buoyancy. The avatar feels a cool, damp pressure against their temples, as if submerged in a refreshing spring, regardless of their actual environment.
Extra-Sensory:
- Hydro-Intuition: The user gains a “sixth sense” for the movement of all nearby liquid. They can “feel” the blood pumping in a foe’s veins or the moisture content in the air, allowing them to pinpoint hidden creatures through their biological “ripples.”
- Tidal Precognition: A momentary overlap of time occurs where the user sees a “ghost image” of the water’s movement three seconds into the future, revealing where a wave—or an enemy’s strike—will land before it happens.

Observer’s Perspective

Visual: The shell’s abalone lining flares with an intense, rhythmic ultraviolet light that casts dancing, water-like reflections onto nearby surfaces. The swirling whirlpool within the shell begins to emit tiny, glowing bubbles that defy gravity, floating upward before dissolving into sparks.
Auditory: Those nearby hear a low, resonant “thrumming” sound, like a large bell struck underwater. During a Ritual Chant, this sound transforms into a high-pitched, harmonic whistling that mimics the sonar pings of a dolphin.
Tactile: A sudden increase in humidity is felt within a 10-foot radius. Observers might feel a faint “tug” on their own physical forms, as if a gentle current were trying to pull them toward the avatar.
Extra-Sensory: Other sentient beings feel a sense of “Abyssal Pressure” on their Mind’s Eye. It is a heavy, stabilizing presence that feels like being at the bottom of a calm lake—peaceful yet slightly suffocating to those not attuned to the aquatic.

Positives

Absolute Orientation: The avatar cannot become lost or disoriented while underwater; the shell constantly aligns their Mind’s Eye with the world’s magnetic and tidal poles.
Emotional Calm: The “Joyous Lake” magic flushes away fear and panic, providing the user with a “Nearly Impossible” level of mental focus during high-stress combat or navigation.
Fluidity: The user’s movements become more efficient; they move through the water (or air) with 10% less resistance, as if the environment itself is helping them glide.

Negatives

Sensory Overload: If the avatar is in a dry, noisy environment, the shell’s sonar “pings” can become deafeningly loud to the user, causing a dull headache and a -1 penalty to Perception for one hour after use.
Dehydration: The item draws a microscopic amount of moisture from the avatar’s body to maintain the internal whirlpool. Frequent use requires the avatar to consume twice the normal amount of water.
Vulnerability to Sound: Because the avatar’s senses are hyper-tuned to vibrations, a sudden loud noise (like an explosion or a thunderclap) can “stun” the avatar, causing them to drop the shell as their senses “reset.”

Alchemical-Aqueous Schematic: The Resonant Tide-Shell

Materials Needed

Tier 1 Magic Crystal: A coin-sized crystal, ideally harvested from an aquatic beast like a Giant Coral-Crab or a Deep-Sea Angler, to serve as the hydrostatic heart of the whirlpool.
Large Pristine Gastropod Shell: A conch or whelk shell at least eight inches in length, free of structural cracks and naturally resonant.
Iridescent Abalone Veneer: Thin sheets of high-quality abalone or mother-of-pearl to line the interior, acting as a reflective surface for “True Sight” spectrums.
Enchanted Seawater: One pint of water gathered from a “Safe Area” tide-pool during the hour of Helios-up (6:00), stabilized with a pinch of alchemical salt.
Copper Filigree: Fine wire used to bind the magic crystal to the shell’s spire and to create the “Mind’s Eye” contact points.

Tools Required

Hydrostatic Press: A small, steam-powered chamber used to infuse the seawater into the crystal without it evaporating.
Silver Etching Needle: Used for the delicate task of hand-carving the trigrams into the pearlescent surface of the shell.
Alchemical Bonding Resin: A waterproof, magic-conductive sap used to secure the abalone lining and the copper filigree.
Acoustic Tuning Fork: Calibrated to the frequency of the “Abyssal Water” to ensure the shell’s sonar “pings” are correctly pitched.

Skill Requirements

Trained Skill: Alchemical Crafting: Level 1 minimum. Required to stabilize the seawater and bond the magic crystal to the organic material of the shell.
Trained Skill: Nature (Aquatic): Level 1 minimum. Necessary to understand the flow of the “Changing Lines” within the water to calibrate the whirlpool.
Trained Skill: Navigation: Level 1 minimum. Required to ensure the passive sonar and “Joyous Lake” directional magic align with the world’s poles.

Crafting Steps

Preparation of the Vessel: Clean the gastropod shell of all organic debris using a mild alchemical wash. Ensure the interior is smooth. Use the bonding resin to apply the abalone veneer to the aperture, creating a shimmering, iridescent “focus” for the magic.
Inscribing the Hexagrams: Using the silver etching needle, carve the eight primary trigrams onto the exterior of the shell in a circular pattern around the spire. This requires a “Medium” Skill Check; a failure causes the “Blind Sight” to perceive distorted, overlapping gray shadows.
The Heart of the Tide: Place the Tier 1 Magic Crystal inside the hydrostatic press with the enchanted seawater. Apply steam power to force the essence of the water into the crystal’s lattice. The crystal should turn a deep cerulean and begin to vibrate.
Seating the Conduit: Mount the infused crystal into the deepest spiral of the shell’s interior. Secure it with copper filigree, running the wires along the internal ridges of the shell to the “Hand Slot” grip area.
Manifesting the Whirlpool: Pour the remaining enchanted seawater into the shell. Perform a “Normal Chant” of the “Trigram of the Lake.” If successful, the water will begin to swirl into a self-contained vortex that does not spill, even when the shell is turned upside down.
Acoustic Calibration: Strike the tuning fork and hold it against the shell. Adjust the tension of the copper filigree until the shell emits a consistent, low-frequency hum. Once the “Mind’s Eye” perceives the first sonar “ping” as a clear gray ripple, the item is ready for attunement.

Shell Which Swallows Moon’s Wetness

In the epoch when the crust of the moon Saṃsāra was yet soft like the belly of a newborn dugong, and the gas giant VaporSphere hung in the high-up-place like a ripening fruit of purple gases, there was a Great Wetness. Before the nine thousand years were whispered by the scribes of the ink-well, the first spirits of the water-gestalt moved in the salt-silence. They were not as we are, with limbs of meat and bone, but were as shifting currents of “Mind’s Eye” potential.

Among these fluid-beings was one named Kan-Tui, the First-Diver. Kan-Tui possessed the “Transient Global Amnesia” of the very first soul-birth, knowing not where the multiverse ended and the “Tidal Revelation” began. He swam through the deep trenches where the “Deathly Areas” of the crushing dark-water reside, seeking a focal point for his “Power of Thought.” Without a shell or a stone, his magic was as a drop of fresh water in a salt-ocean—lost and without “Tier Level” or “Resilience.”

It is recorded in the tablets of the barnacle-crust that Kan-Tui traveled to the edge of a great underwater volcanic vent. There, the “Elemental Age” was still screaming. The fire of the deep earth met the water of the moon-shell, creating the “Mechanical Power Transmission” of the first steam. In this place of boiling bubbles, Kan-Tui found a gastropod of “Legendary” size, its shell a spiral of sixty-four chambers, each one a “Hexagram” carved by the grinding of the tides.

Kan-Tui took this shell and performed the “Ritual Chant” that lasts for seven months of seven weeks. He sang to the “Magic Crystalline Cells” of the deep-sea virus until they grew into a “Tier 5” soul-battery within the shell’s spire. He did not use a “Simple Attunement” of a single minute; he bound his very “Memories” to the abalone lining, so that the shell and the diver became a single “Gestalt.”

As he sang, the “Wild Magic” of the trenches swirled into the shell’s mouth. The water did not flow out, but began to spin into the first “Abyssal Tide-Pool.” Through this vortex, Kan-Tui could see the “Stats” of the entire ocean. He saw the “Armor Check” of the leviathans and the “HP” of the coral-kings. He saw the “Changing Lines” of the future weather, predicting the “Tropical Cyclones” before the wind even dared to breathe upon the surface.

But the translation of the ancient foam tells of a Great Drowning of Wisdom. Kan-Tui became too enamored with the “Sonar” of his own greatness. He used the “Casting the Yarrow-Reeds” magic to foresee the “Items” of other divers. He would tell the “Monarchy” of the underwater metropolises which of their “Guild Masters” were “Rule Breakers” with “False Names.” He used the “Sonar” to find the “Soul Crystals” of those who had died, harvesting them to power his own “Group Powered Items.”

The goddess Gaialilith, who is the world and the “Matriarch of the Divine,” looked down through the “Vapor-Spire.” She saw that Kan-Tui was ignoring the “Divine Restrictions” placed upon the “Worn Gear Slots.” He had “Attuned” more than ten items of the highest “Tier,” and the “Consequences” of the gods began to manifest as the “Pain of the d4 Dice.” His “HP” began to leak away like water through a cracked hull.

An ambassador of the “Pearl-Seers,” bearing a “Hunters Mark” of the highest rank, was sent to parley. But Kan-Tui’s “Mind’s Eye” was overwhelmed by the “Over-Power” of his own shell. In the “Evening” hour of 17:59, as the Helios-star went down behind the “VaporSphere” eclipse, Kan-Tui tried to use the “Mana Boost” to stop his death. But the “Silver Fire” was too great for his “Tier 1” physical vessel.

In a flash of purple sparks, Kan-Tui’s avatar vanished. He left behind a “Soul Crystal” the size of a covered wagon and the original Yijing 0 shell. It is said the original shell was so “Buoyant” it floated up through the planes of existence until it reached the “Astral” sea, where it remains “Bound” to the location of the first tide-pool.

Before he was un-made, Kan-Tui scattered the “Memories” of the recipe into the “Mind’s Eye” of all aquatic beings. He made the shells “Common,” so that no one diver would ever have the “Nearly Impossible” power to see everything, for such sight is a “Banishment Mark” from the peace of the current.

The Moral of the Story He who tries to hold the entire ocean within a single shell will find his hand too heavy to swim, for the tide is meant to be followed, not contained within the pocket of one’s pride.

Suggested conversions to other systems:

Call of Cthulhu (7th Edition)

Unique Name: The Resonant Shell of the Deep

Item Type: Occult Artifact
Skill Bonus: Grants a +15% bonus to Diving and Navigate (Sea) rolls while submerged and held.
Special Ability (Echoes of the Abyss): By spending 2 Magic Points, the investigator can “ping” the surrounding water. This functions as a sonar pulse, granting a Bonus Die to Spot Hidden checks to locate submerged objects or creatures within 10 yards, even in total darkness.
Sanity Cost: Peering into the swirling vortex of the shell to foresee a “Changing Line” requires a Sanity roll (0/1d3 loss). On a failure, the investigator is momentarily mesmerized by the infinite depths.
Syntax: The Investigator must hold the shell to their ear to receive the auditory data. If the user is on land, the bonuses are halved and the MP cost is doubled.

Blades in the Dark

Unique Name: Leviathan-Oil Tide-Conch

Item Type: Fine Arcane Implement (1 Load)
Tier: I
Quality: Fine (+1 Tier for determining effect when navigating black-water or deep-sea environments).
Mechanic (The Flow of Fate): When you Survey or Study the movements of an aquatic threat or a naval vessel, you may take 1 Stress to ask the GM: “Which way is the current of luck flowing?” The GM will describe a “Changing Line” (a vulnerability or an upcoming opportunity) that grants you +1d to your next action against that target.
Passive: This item counts as Fine Diving Gear for the purpose of resisting the pressure and cold of the Ink Sea.
Syntax: The shell hums with ghost-field energy. Using it attracts the attention of any nearby Echoes or Riven souls within the water.

Dungeons & Dragons (5th Edition)

Unique Name: Yijing Conch of the Azure Vortex

Item Type: Wondrous Item
Rarity: Common
Attunement: Required (Simple Attunement – 1 Minute)
Properties:
- Passive (Aquatic Adaptation): While holding this shell, you have a swimming speed of 30 feet, and you can breathe underwater.
- Sonar Pulse: As a Bonus Action, you can send a pulse through the water. For 1 minute, you have Blindsight out to a range of 30 feet, provided both you and the target are submerged.
- Active (Identify): You can use an Action to perform a ritual with the shell’s internal whirlpool to cast the Identify spell on a submerged object. Once used, this cannot be used again until the next dawn.
Syntax: The shell occupies one hand. If the user is Tier 1, the item functions normally. If the user attempts to use a Tier 2 version without leveling up, they suffer 1d4 psychic damage every minute.

Knave (2nd Edition)

Unique Name: The Oracle Conch

Item Type: Tool (1 Slot)
Quality: 12 (Resilience)
Armor: +1 AC (Standard AC rules apply; cannot exceed 3 per level).
Mechanics:
- Navigation: While submerged, the user always knows the direction of the nearest safe harbor or air pocket.
- Read the Tide: Once per day, the user may roll a Wisdom Check to foresee an enemy’s next move. On a success, the user gains Advantage on their next Attack Roll or Saving Throw.
- Identification: By spending 10 minutes (Ritual) watching the whirlpool, the user identifies the properties of one magical item found underwater.
Syntax: If the user rolls a 1 on a swimming or navigation check while holding the shell, a Failure Card is drawn as the “Wild Magic” of the tide turns against them. A natural 20 allows for a Crit Card draw.

Fate (Core / Condensed)

Unique Name: The Abyssal Conch of Constant Currents

Item Type: Stunt-Granting Extra
Aspect: The Eye of the Hydrostatic Storm
Stunt (Tidal Navigation): Because I possess the Abyssal Conch, I get a +2 to Notice or Drive (Aquatic) actions when I am navigating treacherous underwater currents or searching for submerged treasures.
Active Ability (Consult the Vortex): Once per session, you may spend a Fate Point to “Read the Swirl.” This allows you to automatically create a Situation Aspect representing a localized tactical advantage (e.g., Anticipated Surge or Vulnerable Gills) with two free invokes.
Syntax: Using the conch requires the user to be submerged or in a high-humidity environment. On land, the user must succeed at a Will roll to overcome the “Sensory Overload” of the sonar pings.

Numenera & Cypher System

Unique Name: The Hydrostatic Trigram Node

Item Type: Artifact (Tier 1)
Level: 1d6 + 1
Form: A large, spiraling shell with an internal turquoise glow that pulses in time with the user’s pulse.
Effect (Sonar Sensing): While held, the user gains an Asset on all perception-based tasks while underwater. This includes detecting movement, identifying creatures, and finding hidden structural flaws in sunken ruins.
Active (Aqueous Identification): The user can spend 2 Intellect points to use the internal whirlpool to identify the function of one unknown aquatic device or chemical substance.
Depletion: 1 in 1d20. Upon depletion, the “Enchanted Seawater” within evaporates instantly, leaving a mundane shell.
Syntax: If the user is not an aquatic species, they must spend an additional round of concentration to translate the “Abyssal Water” gray-scale vision into a recognizable mental map.

Pathfinder (2nd Edition)

Unique Name: Yijing Tide-Caller’s Shell

Item Type: Held (1 Hand); Item 1
Usage: held in 1 hand; Bulk: L
Traits: Divination, Magical, Water
Mechanic (Navigator’s Joy): You gain a +1 item bonus to Survival checks to Sense Direction and Nature checks to identify aquatic animals or plants while the shell is held.
Activate (Single Action): (Envision) You “ping” the water. You gain Senses: Wavesense 30 feet for 1 minute. This only functions if you are submerged in a liquid.
Activate (Two Actions – Normal Chant): (Envision, Interact) You focus on the internal hexagrams. Your next Strike or Basic Maneuver before the end of your next turn gains a +1 status bonus to the attack roll as you foresee the target’s movement.
Syntax: If the user is Tier 1, they roll 1d20 + 1d4 for the activation check. Success reveals the target’s AC and Current HP.

Savage Worlds (Adventure Edition)

Unique Name: Abyssal Oracle Shell

Item Type: Gear (Enchanted)
Rank: Novice
Weight: 1 lb
Core Mechanic (Sonar): The bearer ignores all Illumination penalties while underwater out to a range of 10″, perceiving their surroundings via Infravision (represented as sonar-processed shades of gray).
Power (Tidal Revelation): As a Limited Action, the user may spend 1 Power Point to activate the detect arcana power, but only on submerged objects. This also reveals the object’s current Toughness and any structural Wounds.
Syntax: If the user suffers a “Shaken” or “Stunned” result from a sonic-based attack, the shell is automatically deactivated and requires a Spirit roll to restart the internal whirlpool.

Shadowrun (6th World Edition)

Unique Name: The Mana-Wave Sonar Conch

Item Type: Awakened Focus (Detection)
Rating: 1
Essence Cost: 0 (Worn/Held)
Capacity: 1
Mechanic (Hydraulic Awareness): While the user is submerged, the conch provides a +1 dice pool bonus to all Perception and Navigation tests. This bonus specifically ignores penalties from murky water or silt, as the mana-waves act as a magical sonar.
Active Ability (Reading the Hexagram): By spending a Minor Action to observe the internal whirlpool, the user may gain the Tactical Awareness quality for one combat round. This represents the foresight provided by the “Changing Lines” of the tide.
Syntax: If used in a high-pollution (Mana Ebb) aquatic environment, the user must resist 2S (Stun) damage from the feedback of the shell’s straining resonant frequency.

Starfinder (2nd Edition / Playtest)

Unique Name: Abyssal Hydro-Diviner

Item Type: Hybrid Item (Eye or Hand Slot)
Level: 1; Price: 135 Credits
Bulk: L; Capacity: 20; Usage: 1/hour
Passive (Sonar HUD): While submerged and active, the item grants the user Wavesense (30 feet). This information is fed directly into the user’s Mind’s Eye or digital visor, appearing as wireframe gray-scale outlines.
Activate (Two-Action Task): You expend 1 charge to focus on a submerged target. This functions as a “Scan” action, revealing the target’s Current HP, EAC, and KAC. You also gain a +1 circumstance bonus to your next attack roll against that target before the end of your next turn.
Syntax: The device uses a Magic Crystal battery. If the crystal is depleted (1 in 1d20), the internal whirlpool collapses and the “Wavesense” is lost until a new Tier 1 crystal is installed.

Traveller (Mongoose 2nd Edition)

Unique Name: Bio-Organic Tidal Scanner

Item Type: Specialized Survival Gear (Tech Level 13)
Weight: 0.5 kg; Cost: Cr 2,000
Skill Bonus: Provides a DM+1 to Athletics (Swimming) and Navigation (Surface or Subsurface) checks while the scanner is active and held.
The Abyssal Water (Active Pulse): The scanner can perform a “Tidal Analysis” of the local water column. This requires an Average (8+) Science (Oceanography) or Electronics (Sensors) check. Success grants a DM+2 to the next check made to detect hidden submarines, sea creatures, or submerged structures.
Syntax: The scanner is vacuum-sealed but functions best at high pressures. In environments with less than 1 atmosphere of pressure, the internal whirlpool becomes unstable, imposing a DM-2 penalty to all sensor checks.

Warhammer (Age of Sigmar: Soulbound / 4th Edition)

Unique Name: Conch of the Jade Tide-Seer

Item Type: Arcane Artefact / Focus
Availability: Rare
Traits: Magical, Aquatic, Fragile (Resilience 12)
Mechanic (The Abyssal Tide): The bearer gains a +1 Training (or +10 bonus in 4th Ed) to Nature and Survival tests while underwater. The Mind’s Eye allows the user to see “Current Ribbons” in the ultraviolet spectrum, marking safe passages through reefs.
Activable (Normal Chant): The user may attempt a Mind (Survival or Channelling) test to “Consult the Shell.” Success grants the user Advantage on their next Melee or Ranged attack as the water reveals the target’s impending shift in the current.
Syntax: If the user rolls a Complication (or a Fumble), the shell emits a sonic “scream” that alerts all creatures within 100 yards to the user’s presence. The item is “Bound” to the soul of the bearer.