The Black Lake (Underwater HP RPG)

[System_Rule: Abyssal_Madness] Keywords: Madness, Brain, Echo, Counter, Occlumency

• Essence: Passive counter of the mental pressure of the water column on the mind of a mage without High Occlumency.
• Mechanics: Every 6 turns below 30 meters, the AI forces the mage to undergo a mental toughness test. The insanity counter increases by +1 point with each failure.
• Effect: At point 3, the user begins to hear a false echo of the "Voice of Truth" of Aquila's sirens, disorienting them. At the 5th point, the User's Head Bubble begins to pulse and loses 30% of its durability from the magician's mental spasm. Counter reset - rest in the Gringotts bunker.

[System_Rule: Gate_Lag] Keywords: Gate, Lock, Delay, Piston

• Essence: AI rule governing the opening phase of Slytherin's Underwater Hydro Locks (Card 16).
• Mechanics: Salazar's hydraulic lock opens slowly. After successfully singing the Ssz + Hsh rune script, the stone pistons of the airlock move apart in exactly 2 tactical moves.
• AI Rule: The user must hold a position at the grid for these 2 turns, fighting off the grindilow mechanisms that run into the noise. Posts "I hissed and immediately entered" are harshly rejected by AI.

[Item: Emergency_Air] Keywords: Cylinder, Accident, Oxygen, Syringe

• Description: A small reserve tank of pure oxygen attached to the chest of the Diver's suit.
• Function: If the main hose is slashed by the Aquila's siren claws or pierced by Murkus' Spear, this tank gives Magle an emergency 3 Clean Breaths to inject the Decompression Serum and begin the ascent.
• Penalty: Using the cylinder without first sealing the spacesuit hole with a tactical knife and resin. Oxygen will simply go into the water in half a stroke.

[Artifact: Siren_Shell] Keywords: Shell, Amplifier, Scream, Siren, Aquila

• Description: An ancient, Salazar-covered nautilus shell hidden in the Sunken Archives. Artifact for the Siren (Level 1).
• Function: Doubles the radius and crushing power of Marina/Aquila's Voice of Absolute Truth underwater. Allows you to stun an entire Murkus combat patrol with a single scream.
• Vulnerability: The shell emits a constant, quiet hum that newts can hear from 30 meters away. The Siren's stealth drops by 20%.

[Resource: Sonar_Static] Keywords: interference, sonar, screen, glitch, static

• Essence: AI rule that restricts the operation of the Muggle Portable Sodar (card 20).
• Mechanics: If Muggle gets close to the Sunken Library or Gringotts Safes, the density of magic fields increases. The sonar screen is covered with ripples and static.
• AI Rule: In these zones, the Bot stops showing an accurate bottom map on the sonar screen. Muggle must move blindly, probing the silt with a snake hook.
• Penalty: Continue to navigate the flashing sonar screen during interference. Muggle is guaranteed to step on a hydraulic trap.

[Trap: Toxic_Weeds] Keywords: plantation, algae, loop, traps

• Description: Thickets of black, snake-like algae in the southern depression of the lake.
• Mechanics: Plants react to strong hydro-dynamic waves (User's fast swimming or flippers). They reflexively shoot threads, tightly binding the ankles and waist of the user.
• Penalty: Try to swim through the plantation at high speed. Seaweed tightens a dead loop around the magician's neck or Muggle hoses. Choke and drop Oxygen by 40% per turn.

[Item: Triton_Spear] Keywords: spear, newt, bone, weapon, trophy

• Description: A heavy spear carved from the rib of an ancient leviathan, a trophy weapon that can be picked up after a fight with a Murkus patrol.
• Function: The tip is infused with poison that blocks mages' Occlumency. The Spear is able to pierce Head Bubbles and bypass kinetic barriers due to its chthonic nature. Muggle can use it as a melee weapon instead of a knife.
• Penalty: Use a spear without the Siren buff or Dragon Gloves. The poison from the shaft is absorbed into the User's palm, causing wild migraines and hallucinations (minus 30% HP, loss of concentration).

[Location: Gringotts_Caches] Keywords: Cache, Niche, Goblins, Galleons, Battery

• Description: Small, sealed alcoves in the rocks, marked with a goblin brand, created by Cursebreakers to drop emergency equipment.
• Search mechanics: Roxanne sees them under an NDA contract, Muggle can detect them with sonar (the metal of the niche is phoning).
• Reward: Inside you can find a spare battery for Muggle Sonar, a Decompression Syringe, or a Scaly Kelpie Skin.
• Penalty: Attempting to open a niche with a knife without entering a rune code. Gringotts' defense is triggered: the user is shocked with a force of 220 volts. Minus 50% HP, body paralysis for 1 turn.

[Enemy_AI: Grindylow_Swarm] Keywords: avalanche, grindylow, devils, fingers, attack

• Combat mechanics: Grindylow in Grindylow_Nests (card 27) never attack alone. They fly out of the crevices in dozens, surrounding the user in a dense ring.
• Behavior: Grab your arms in sync, blocking your wand, and aim their long claws at your suit mask or Head Bladder.
• Penalty: Attempt to shoot back one devil with a harpoon or hit with a pinpoint spell. The rest of the grindylow cling to the body in a second, burst the bubble/hose and drag the user to the bottom.

[Muggle_Gear: Spear_Ammu] Keywords: Arrows, Harpoon, Charge, Slot

• Mechanic: The Muggle Heavy Suit holds a hard limit of 3 steel arrows for the Air Harpoon. It is IMPOSSIBLE to find new ammunition at the bottom of the lake.
• Tactics: Muggle must describe the pickup of arrows fired from the bottom after a successful fight. Posts like "I shoot endlessly" are harshly rejected by AI.
• Penalty: Shoot all 3 arrows in the mud and not pick them up. Muggle is left unarmed in melee/ranged combat in front of an avalanche of grindylows.

[Recipe: Abyss_Antidote] Keywords: Cleanse, Serum, Plankton, Poison, Antidote

• Ingredients: Phosphorus Sludge Extract + Crushed Black Pearl + Phoenix Tears (or Evelyn Chemical Stabilizer).
• Effect: Ultimate Tier Underwater Antidote. Instantly stops the effects of Kelpie's venom, putrefaction from deep-sea silt, and heals wounds from newt spears. Restores 50% HP and cleanses magic channels.
• Limit: The Cursebreaker can only have 1 of these bottles in its bandolier.
• Penalty: Overheating of the base when cooking in the laboratory. The cauldron explodes, the caustic alkali burns out the user's eyes (permanent blindness).

[Ingredient: Squid_Ink] Keywords: Ink, squid, gathering, cloud

• Description: A thick, blue-black, oily essence secreted by the lake's leviathan. It has the ability to extinguish light spells and silence Legilimencia.
• Collection: Collected with a vacuum syringe from the siphon sinuses of a sleeping Squid. Requires perfect non-verbal secrecy of the "Msh" rune.
• Purpose: Needed by Elisa Rosier to create hidden curses of slow withering blood and Roxanne to bind spirits.
• Penalty: Make noise or hit the Squid's tentacle when collected. The Leviathan reflexively releases a huge cloud of ink, blinding the user for 5 turns, and smacks with its tail. Spacesuit/bubble breakdown.

[Trap: Sea_Thermocline] Keywords: thermocline, cold, depth, cramp, spasm

• Description: A sharp invisible boundary between the warm upper layers of lake water and the icy abyss (at depths below 25 meters).
• Mechanics: When crossing a border, the temperature drops to zero per second. Without Gringotts' Amulet of Pressure or Siren's buff, the mage's body is convulsed by a wild convulsion.
• Penalty: Jump into the thermocline without preparation. A muscle spasm blocks the movement of the hands, the stick slips out and flies to the bottom. The user loses 30% of Stamina and begins to drown uncontrollably.

[Location: Graveyard_Anomalies] Keywords: Anomaly, Graveyard, Compass, Background, Arrow

• Description: Magical anomalies on the Sunken_Graveyard caused by the background debris of a thousand old Hogwarts artifacts.
• Mechanics: Compasses, Scientists' mental radars, and Muggle sonars are completely insane in this sector (screens start flashing and giving out false outlines of creatures).
• Tactics: The user is obliged to turn off the sonar and navigate solely by the Siren's physical sense or the non-verbal smell of ozone.
• Penalty: Blind trust to a broken sonar/screen. The user swims directly into the mouth of the sleeping Water Kelpie.

[Name: Merfolk_Chieftain] Keywords: Murkus, Warchief, Newts, Spear, Patrol

• Description: Leader of a paramilitary patrol of newts, controlling the approaches to the caves.
• Habits: Does not negotiate with land mages. He directs the patrol along the heat trail. Armed with a heavy trident made of narwhal bone, enchanted to break kinetic barriers.
• Penalty: Attempting to attack it head-on or swim ahead. Murkus makes a non-verbal swing of the trident, creating a powerful shockwave. The head bubble bursts, Muggle's spacesuit cracks. Minus 70% HP, the user begins to drown.

[Resource: Oxygen_Bubbles] Keywords: Oxygen, Tank, Bubble, Breath, Barotrauma

• Consumption Mechanics: The Mage controls the durability of the Head Bubble (decreases by 10% every 3 turns). Muggle controls the pressure scale of the spacesuit's cylinders.
• Panic/Anger/Enemy Attack Surge: Your oxygen consumption is doubled. If the gauge drops to 20%, the AI turns on the "Deep Suffocation" status. The user begins to lose 15% HP every turn.
• Penalty: Ignores the drop in the strength of the bubble/cylinder. Bubble bursts - instant hydro-shock, lung barotrauma and death in 1 turn.

[Inventory: Diver_Rig]

• Capacity: Available for Divers (Level 3). Heavy weight is limited to 25 kg due to the nature of the water. 8 equipment slots.
• Specificity: Metal spacesuit with oxygen cylinders. Lead protects electronics from Hogwarts magic while the hatches are closed.
• Default Items: Air Harpoon (3 arrows), Portable Sonar, Audio Receiver, 4 batteries, 2 decompression syringes, Tactical Knife, Snake Hook.
• Penalty: Overloading the suit with heavy junk from the Sunken Graveyard. Muggle instantly falls to the bottom and gets stuck in deep silt without the ability to move. Oxygen begins to be spent twice as fast.

[Inventory: Cursebreaker_Belt]

• Capacity: Available to Gringotts Mages (Level 2). It has 5 sealed waterproofed potion cells and 2 fasteners for pressure artifacts.
• Specificity: A belt made of Kelpie leather, protected by the "Hsh" (stasis) rune, which keeps the Head Bladder from detonating when hit by newts.
• Default Items: Ebony Wand, Rune Oscilloscope, Gringotts Amulet of Pressure, 2 Void Breath Potions, 1 Empty Silver Flask
• Penalty: Attempting to place a bottle of potion in a normal robes pocket. The water of the lake instantly washes out or breaks the vial with pressure. The resource was destroyed.

[Inventory: Siren_Slots]

• Capacity: Available for Hybrid Siren (Level 1). The physical inventory is strictly limited to 3 slots, as the Siren has a tail in the water instead of legs and does not carry bags.
• Specificity: All items are held by magical cache shells on a pearl belt. Complete immunity to water pressure.
• Default items: Sunken Archive Key, 1 bottle of Lilac Magnetism Lotion, 2 Black Abyss Pearls.
• Penalty: Attempting to lug a heavy steel goblin safe or a Muggle rifle. The siren loses supersonic swimming speed (minus 80%), becomes clumsy and vulnerable to newt spearmen.

[Recipe: Abyss_Vision] Keywords: recipe, eye of the abyss, drops, vision, plankton

• Ingredients: Essence of Planktonic Oil + extract from the eyes of blind cave boas + distilled water of the Black Lake. Recipe by Evelyn Clark.
• Effect: Grants the mage absolute night vision underwater through all silt and fog for 6 turns. The user sees the thermal contours of grindilow and newts.
• Penalty: Violation of plankton oil filtration technology. The droplets turn into acid. When instilled, the user receives a chemical burn to the eyes and permanent blindness until the end of the quest.

[Ingredient: Kelpie_Skin] Keywords: Kelpie skin, scales, molting, algae

• Description: A tough, slimy skin that the Kelpie sheds when molting in the Rotten Marsh of the lake.
• Purpose: An indispensable material for creating sealed Alchemical Bandolier of the Scientist and waterproofing Muggle devices. A cut piece of leather completely dampens the water pressure within a radius of 1 meter.
• Penalty: Attempting to pick up a piece of skin without checking the surrounding kelp thickets with sonar. A living Kelpie hiding nearby attacks the user with his hooves to the chest. Spacesuit/bubble breakdown, minus 60% HP.

[Ingredient: Black_Pearl] Keywords: pearls, abyss, shell, gathering, knife

• Description: Large, matte black pearls ripening in the shells of giant clams in the Artifact Graveyard under the influence of Slytherin magic.
• Collection: The shell is opened with a tactical knife made of Damascus steel or secured with a snake hook. The mollusk reacts to heat.
• Purpose: Main amplifier of wave magic. Alaric Ollivander uses it to create high tier wands, and Marina uses it for luxury mental goods.
• Penalty: Haste to collect. The shell flaps are reflexively closed with the force of a hydraulic press. The user breaks/chops off his hand. Minus 40% HP, wand sorcery is blocked.

[Location: Grindylow_Nests] Keywords: nest, grindylow, devils, flock, silt, algae

• Description: A network of deep, narrow crevices on the border of the Dry Locks, covered with swamp mud. The abode of thousands of aggressive grindylows.
• Enemy Habits: They attack from all sides, cling to Muggle's flippers, oxygen hoses, and try to rip off the Mage's Head Bubble with their long, prehensile fingers.
• Traverse Tactics: The sector requires Kai Ookami's Glacius Area Ice Charm or Muggle's Pneumatic Harpoon Point Shots.
• Penalty: Attempting to swim through crevasses without being alert. Grindilow dragging the user into the silt. Minus 50% Oxygen for 1 turn, the User is immobilized in a cocoon of algae for 2 turns.

[Location: Sunken_Library] Keywords: library, books, archive, scrolls, bottom, ruins

• Description: A submerged wing of an ancient tower at the bottom of a lake that went under water 500 years ago. Inside are rune-sealed, waterproof tomes and scrolls of high alchemy.
• Feature: The Archives are protected by the "Slytherin Ghost Fangs" (Card 63 in the Dungeons). Any wrong movement raises tons of centuries-old silt from the bottom, nullifying visibility.
• Reward: A key location for Astra Blackwood and Evelyn Clark - here are the blueprints for underwater rune charms.
• Penalty: Attempting to open a scroll chest without the "Hsh" rune. The defense works as a hydro shock, breaking the mage's fingers and shattering the mask of Muggle's suit.

[System_Rule: Nitrogen_Barotrauma] Keywords: decompression, barotrauma, ascent, depth

• Essence: A hard AI rule that controls the phase of the User's ascent to the surface.
• Mechanics: If the User is at a depth of more than 20 meters, he CANNOT write in the chat "I just swam up quickly and surfaced". The lift should take at least 2 tactical moves (decompression phase).
• AI Penalty: Violation of the rule of ascent (a sharp leap up from fear) = caisson sickness and pulmonary barotrauma. The blood boils, the lungs tear. Absolute Permadeath.

[Recipe: Decompression_Serum] Keywords: serum, decompression, syringe, nitrogen, first aid kit

• Ingredients: Magla chemical reagents + distilled plankton oil + atropine.
• Effect: Tucks into the syringe tube of the tactical backpack. In case of emergency ascent from great depths, it prevents nitrogen from boiling in the blood and rupture of the lungs. Restores 40% HP.
• Limit: A maximum of 2 of these syringes can fit in the backpack.
• Penalty: Error in dose calibration when crafting in the mini-lab. Serum causes instant arterial thrombosis and Muggle cardiac arrest.

[Recipe: Siren_Charm] Keywords: lotion, ointment, cosmetics, plankton, algae

• Ingredients: Essence of Planktonic Oil + mucus of Brown algae + a drop of Syren's blood. Marina's beauty line recipe.
• Effect: Exclusive to elite Hogwarts students. When applied to the skin, it gives a passive, mild effect of lilac magnetism: it fascinates others, lulls the vigilance of teachers and elders.
• Penalty: Exceeding the dose of Siren blood when crafting. The lotion turns into a caustic ointment that corrodes the skin. The user's face is covered with scars, charisma drops to zero, HP minus 30%.

[Ingredient: Plankton_Oil] Keywords: Oil, plankton, extract, cauldron

• Description: A thick, phosphorescent amber extract from glowing plankton, processed into Merlin_Abandoned_Lab.
• Collection: Boiled by the Scientist (Level 2) in a sealed copper boiler under strictly constant pressure.
• Purpose: A basic preservative for Marina's underwater alchemy. Allows potions to maintain a stable structure in the icy water of the lake for years.
• Penalty: Violation of the temperature regime when cooking butter. The cauldron explodes with thermal blue flames, destroying all of the Scientist's devices and causing 50% HP damage to the body.

[Ingredient: Kelpie_Hair] Keywords: Kelpie hair, mane, kelpie, knot

• Description: Strong, slippery black threads that resemble swamp stems. They have tremendous cumulative mental power.
• Harvesting: Cut with silver scissors from the neck of a Kelpie who has been put to sleep or bound with the Hsh rune. It requires fixing the animal with a snake hook.
• Purpose: Ultimate Core for Master Wands (Ollivander uses it for Higher Mentalist Wands and Pressure Artifacts).
• Penalty: Attempting to rip the hair off a waking Kelpie. The horse instantly wraps algae around the User's body and pulls him to a depth of 100 meters at maximum speed. Death by pressure for 1 turn.

[Muggle_Gear: Hydro_Sonar] Keywords: Locator, Sonar, Screen, Battery, Scan

• Description: A digital monochrome screen with a sensor attached to the arm of the Muggle Diver's spacesuit (Level 3).
• Function: Sends ultrasonic pulses, drawing a three-dimensional map of the bottom on the screen through silt, algae and cave walls up to 40 meters away. He sees hidden traps and ambushes of newts.
• Resource: Consumes 1 battery per 3 tactical turns.
• Penalty: Forget to turn off the sonar in stealth mode. The pulses of the device create a powerful acoustic wave, which newts and mermaids hear hundreds of meters away. Muggle's position is fully revealed.

[Sense: Sub_Aqua_Echolocation] Keywords: echolocation, ultrasound, squeak, radar, click

• Essence: Underwater tracking mechanics for Sirens and Muggles with Audio Receiver.
• Mechanics: Zero visibility in the green mud. The user is obliged to navigate by sound clicks and sonar. AI broadcasts ultrasonic squeaks to the chat: frequent squeaking = the approach of a flock of grindylows; dull low hum = movement of the Giant Squid.
• Penalty for Ignoring: If the user pushes forward, ignoring the radar/AI warnings about the build-up rumble, he is guaranteed to ambush the newts or the Kelpie ring.

[Name: Siren_Outcasts] Keywords: sirens, Aquila, Adolf, pack, scream, claws

• Description: Predatory primordial sirens of the deep-sea trenches, despising the domesticated "water people" of Hogwarts. They are subordinate only to Aquila.
• Habits: Hunt in complete darkness. They do not use sticks, they beat with sound waves. Their claws are capable of cutting through the steel of the suit like paper.
• Vulnerability: Panicked by the high-frequency resonance of the "Zzz" rune.
• Penalty: Encounter them without masking their scent/pulse with the "Msh" rune. Sirens emit a collective "Voice of the Deep" (ultrasonic screech). The magician's Occlumency burns out, the user loses consciousness, and his Head Bubble bursts from vibration.

[Location: Sunken_Vaults] Keywords: safe, vault, goblins, castle, contract

• Description: Reinforced concrete bunkers carved by goblins into the underwater rocks of the lake before the adoption of the Statute of Secrecy. Used to store the Sacred Twenty-Eight's dark artifacts.
• Access: Safes are protected by the "Gringotts Runemark". Roxanne Cortez has legal access under the Level 5 NDA. A scientist can crack them with the "Rune Oscilloscope" if he picks up the frequency for 3 turns.
• Reward: Vault of ancient patents for potions, gold, and cursed Black rings.
• Penalty: Error when cracking the safe code. A vacuum trap is turned on: within a radius of 10 meters, water instantly boils from magical pressure. The magician gets a barotrauma of the lungs, Muggle - the total destruction of the spacesuit.

[Location: Salazar_Gates] Keywords: sluice, grate, lever, lock, valve

• Description: Massive wrought iron grates on the rocky slope of the lake floor. These are external water intakes connected directly to the Salazar_Ancient_Sewers (underground sewerage).
• Hacking Mechanics: Locked with a magical hydro-lock. To open the airlock, Gloom (Level 1) must hiss the Ssz+Hsh rune script at the dolphin's ultrasonic frequency, causing the water to move the pistons.
• Reward: A direct, safe path from the lake to the castle, bypassing Carrow's patrols.
• Penalty: Attempting to tear apart the grate with a force or a Reducto spell. The protection is activated: the airlock turns on the reverse draft. The user is pulled into the turbine of the valves. Pressure cripples the body (minus 60% HP, spacesuit/bubble breakdown).

[System_Rule: Lake_Panic_Drowning] Keywords: panic, suffocation, bubble burst, balloon

• Essence: AI penalty if the User in a critical underwater situation (Kelpie attack, being surrounded by newts) chooses the action "I'm panicking trying to swim up".
• Mechanics: When climbing abruptly without a tactical plan (decompression), Muggle's blood boils, and the Mage's Head Bubble bursts from fear.
• AI Penalty: Instantly drops your Oxygen level to 0%. The user begins to convulsively swallow the icy water of the Black Lake. Death by suffocation after 1 turn if Siren Marina doesn't save him with her potion.

[System_Rule: Magic_Eruption] Keywords: Vein explosion, cables, flare, radiation

• Essence: A strict ban on powerful wand sorcery at depth near Muggle technology.
• Mechanics: Beneath the bottom of the Black Lake are ancient magical power veins that power Hogwarts. If a User Mage casts a high tier spell ("Bombard", "Incendio") near a Muggle suit, the fields are short-circuited.
• AI Penalty: A power vein detonates with a burst of pure radiation energy. Both the mage and the Muggle Diver are annihilated on the spot with a clean blast. The quest is over for both.

[Muggle_Gear: Harpoon] Keywords: harpoon, arrow, steel, Muggle, weapon

• Description: Heavy air gun with steel harpoon arrows. The main weapon of the Muggle Diver (Level 3).
• Function: Capable of piercing grindylow chitin and newt bone armor up to 10 meters underwater. The tip can be smeared with Basilisk poison or the Kss rune.
• Limit: A total of 3 harpoons included. Cooldown takes 1 turn.
• Penalty: Attempting to shoot the Giant Squid (Card 5). A steel arrow only angers the leviathan. The squid wakes up and instantly crushes Muggle with its tentacle (Absolute Permadeath).

[Artifact: Diving_Amulet] Keywords: amulet, pressure, Gringotts, protection, barotrauma

• Description: Massive gold medallion with goblin runes, Roxanne Cortez's passive tool.
• Function: Completely dampens the crushing physical pressure of water at a depth of 50 meters, protecting the magician's internal organs from pulmonary barotrauma.
• Limit: Requires recharging with a wand every 6 hours.
• Penalty: If the user descends to a depth below 30 meters with a discharged amulet. The pressure sharply compresses the chest. The AI records internal bleeding (minus 20% HP every turn until the User surfaces).

[Recipe: Amortentia_Perfume] Keywords: perfume, shock absorbence, Roxanne, Val, bergamot, fig- Ingredients: Phosphorus silt + Moon mushroom extract + modified Amortention + notes of bergamot, fig and apple tobacco.

• Effect: Chemical and magical hacking of someone else's mind. When sprayed, the spirits completely relax the target's Occlumency, causing a wild magnetic attraction to Roxanne. The victim himself gives away any secrets.
• Penalty: Trying to use a perfume underwater without a sealed sprayer. The spirits dissolve in the water of the lake, entering into resonance. Roxanne catches the mental blow herself, losing consciousness for 2 turns.

[Recipe: Abyss_Breathing_Potion] Keywords: Recipe, Abyssal Breath, Potion, Oxygen

• Ingredients: Deep-Sea Algae Slime + Crushed Bezoar + Siren Blood + Purified Lake Water. Recipe by Evelyn Clark.
• Effect: If a Mage's Head Bubble bursts, this potion replaces oxygen for 6 turns when ingested, allowing you to breathe water and restore 30% HP.
• Cooking Mechanics: Requires pinpoint temperature control in the lab to prevent the poisonous mucus from kelp from turning into pure cyanide.
• Penalty: Error in proportions when brewing the potion. The cauldron explodes, corrosive gases burn out the user's lungs on a physical level (minus 70% HP, the end of the potions master's career).

[Ingredient: Glowing_Plankton] Keywords: Silt, plankton, phosphorus, serum

• Description: A thick, shimmering silver substance collected from the walls of underwater caves. It has a powerful accumulative magical energy.
• Collection: Collected with a Muggle vacuum syringe or pumped into a Gringotts Cryo capsule.
• Purpose: Used by Evelyn Clark to brew high-tier antidotes and Roxanne to brew perfumes that dissolve Occlumency.
• Penalty: Collect sludge with a normal glass vial. The water pressure at depth crushes the glass in the user's fingers. The splinters cut deep into the palm of your hand, and the blood attracts grindylous and mermaids.

[Ingredient: Deep_Sea_Algae] Keywords: algae, kelp, harvesting, slime

• Description: Long, glowing blue-green filaments of algae growing on the edge of the Sunken Graveyard.
• Gathering: Cut with the Muggle Tactical Knife or the Scientist's Silver Scalpel. Algae mucus is toxic in its raw form.
• Purpose: The main component for Marina's beauty line (cosmetics with lilac magnetism) and for stabilizing Roxanne's mental serums.
• Penalty: Cut algae without sonar/sense checking. In the kelp thickets hides the Water Kelpie (card 5). It attacks from behind, paralyzing the user's magic channels for 5 turns.

[Location: Merfolk_Caves] Keywords: capital, newts, mermaids, caves, camp, warriors

• Description: A labyrinth of flooded caves in the rocky bottom of a lake, home to a community of mermaids and newts. The walls glow with phosphorescent plankton.
• Entry Requirement: Land Mages and Muggles are strictly not allowed to enter. You can only pass under the mental disguise of the rune "Msh", the enchantment of Roxanne or accompanied by the Siren (Marina/Aquila).
• Penalty: Detection of an intruder by the newt warriors. They attack in a crowd with bone spears that pierce the Head Bubble. The user gets barotrauma, loses 80% of oxygen and is chained in deep-sea shackles.

[Location: Sunken_Graveyard] Keywords: graveyard, artifacts, bottom, trash, chest, gold

• Description: A huge hollow at the very bottom of the lake, littered with the lost Hogwarts junk over a thousand years. There are ancient sticks, cursed goblets, gold and tomes.
• Trait: The area is patrolled by the Triad of Tritons (Card 5). All the trash is covered with poisonous deep-sea silt.
• Reward: Exclusive access for Marina/Aquila. Muggle and Scientist can find ancient Slytherin scrolls here if they carefully comb the bottom.
• Penalty: Attempting to pick up an artifact with your bare hands without dragon gloves or a snake hook. Silt eats into the skin, causing necrosis of the flesh. The hand turns black, minus 45% HP, the sorcery is blocked.

[Name: Lake_Bestiary] Keywords: newts, mermaids, squid, grindylow, Kelpie Rules: The creatures of the Black Lake are aggressive towards land mages.

• Triad of Tritons: Warrior Guardians of the Bottom with Bone Spears. They hunt in groups. Mistake = Spacesuit/body puncture, trapped in underwater caves.
• Grindilow (Water Devils): Avalanche attacks, clings to legs, burst Head Bubbles. Requires Area Ice Enchantment or Harpoon Strike.
• Giant Squid: An ancient relic leviathan. Sleeps in the silt. Error (noisy spells/explosions of safes nearby) = awakening, a tentacle strike that breaks bones completely (Absolute Permadeath).
• Water Kelpie: A demonic horse that takes the form of algae. He lures mages by forcing them to sit on it, and then pulls them to a critical depth. The Kelpie's bite paralyzes the magic channels for 5 turns.

[Name: Class_Diver] Keywords: diver, spacesuit, harpoon, locator, Receiver Rules: Level 3. Complete hardcore. The spacesuit is protected with lead from Hogwarts radiation. The locator sees the contours of creatures in the silt, the receiver writes the ultrasound of mermaids.

• Trait: Any use of wand magic near him explodes Hogwarts' underwater cable cores, causing the area to annihilate.
• Penalty: Piercing the suit with the claws of a newt or grindelow = instantly flooding the suit. Death in 1 turn from suffocation and pressure.

[Name: Class_Cursebreaker] Keywords: Roxanne, Cortez, Bubble, Capsule, Safe, Gringotts Rules: Level 2. Uses the charms of the Head Bubble and Gringotts' Cryo Pods to stabilize poisons underwater. Specialist in breaking the ancient spells of Slytherin.

• Advantage: Legal immunity of the Ministry. It has amulets that dampen water pressure.
• Penalty: Momentary delay or concentration failure when attacking grindilow = Head bubble bursts. The user instantly receives pulmonary barotrauma (minus 50% HP) and begins to drown, losing 20% of oxygen per turn.

[Name: Class_Siren] Keywords: Siren, Marina, Aquila, Voice of Truth, Tail, Scales Rules: Level 1. Leg/Legless transformation in the moon or in the water. Supersonic swimming speed, claws, teeth, pearl skin.

• Voice of Truth: Acoustic Call of the Abyss. Dissolves the Mages' Occlumency, forcing them to tell the truth and give away secrets.
• Reward: Full immunity to the aggression of mermaids and newts (their own). Access to the Sunken Artifact Graveyard.
• Penalty: Showing weakness or pity for the newts = losing authority, being expelled from the lake, or being attacked by the water people.

[Name: Lake_Physics] Keywords: lake, water, pressure, oxygen, bubble, battery Rules: Water extinguishes 90% of wand magic. Fire magic is forbidden (causes the wand core to explode).

• Oxygen/Bubble: Consumes 10% every 3 turns. Muggle controls the cylinders, Mage controls the stability of the Head Bladder. Panic/Anger = Oxygen consumption doubled.
• Muggle Battery: Powers sonar and receiver. Consumes 1 charge over 3 turns.
• HUD_Block: The AI must display the following status at the end of the post: [Health, Stamina, Oxygen/Charge, Depth, Psyche].