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Sound

Base: MOMENTUM

Physics: Pressure waves through fluid media. Audible, infrasonic, ultrasonic — any vibration that travels through air or water as a compression wave. Not solid matter (that's Seismic). The medium is fluid.
Signature: The voice that isn't just a voice. The hum under the hum. The sense that the air between you and the user is being used — not moved, not heated, not electrified, but vibrated with a precision that makes every other use of air feel like waste.

F-rank. A voice that carries. Not louder — a voice that reaches, the words arriving clearly at the back of a room when they should have dissolved into ambient noise. The trick is frequency control: unconscious at F-rank, the user shaping vocal resonance to produce frequencies that cut through background noise the way a knife cuts bread. A whisper that somehow crosses a noisy training yard. A hummed note that makes the water in a glass tremble. The sound is not louder — it is more present, as if the air decided this particular vibration was more important and gave it priority. The physical tell: their ears. An F-rank Sound user has already begun to hear differently — not louder but wider, picking up frequencies at human perception's edges, the low groan of a building settling, the high whine of an insect wing two rooms away. They flinch at noises nobody else heard.

E-rank. Directional sound. An E-rank Sound user projects their voice along a vector — a beam aimed at a single person across a room, audible to the target, inaudible to anyone beside them. Can suppress: create a zone of reduced sound around their own head. The projection has physical presence — the target doesn't just hear the voice, they feel it arrive, a faint pressure on the eardrum. Can produce tones outside vocal range: an infrasonic hum that drops below hearing and becomes a physical sensation in the gut, the register that makes people uneasy without knowing why. Or a high whine that sets teeth on edge and makes dogs flatten. The control is imperfect — the beam widens over distance — but the principle is clear: this person is not making noise. They are making specific noise.

D-rank. Sound as force. A D-rank Sound user compresses a wave to the point where it pushes — a focused shout that shoves a target back a step, the air pressure physically displacing the body. Can shatter glass with a sustained tone — not the parlor trick of matching resonance (though they can do that too) but a directed pressure wave exceeding the material's tolerance. The tone is visible in its effects: water ripples, dust jumps in patterns, liquid surfaces draw standing-wave geometries — concentric circles, hexagonal cells. Infrasonic capability weaponizes: a sustained low frequency makes everyone in a room nauseated, dizzy, and deeply frightened without visible cause, the body's organs vibrating at frequencies they weren't built to sustain. The user's hearing at D-rank is preternatural — heartbeats at five meters, footsteps three floors up, the resonant frequency of a locked door that tells them exactly how much the hinges can take. Wynn will be terrifying in tight spaces. A corridor is a waveguide. Sound in a corridor has nowhere to go but forward.

C-rank. Acoustic architecture. A C-rank Sound user controls the soundscape of a space — decides what is audible and what is not, amplifies one conversation while silencing another. Can echolocate: project a click and read the return, building a three-dimensional map more detailed than vision because sound goes around corners. The room is their instrument — resonant frequencies of walls, dampening of furniture, the way sound bounces off stone versus wood versus glass, all known, all used. A focused blast at C-rank damages: directed tone at sufficient intensity ruptures eardrums, destabilizes the inner ear, drops a target in vertigo-blind disorientation lasting minutes. The silence they create is total: a zone where no vibration propagates, and inside it the silence is the deepest a person has ever experienced, the silence of a vacuum, and it is wrong, and the wrongness makes the heartbeat very loud because it is suddenly the only sound in the world.

B-rank. The medium is an extension of the body. A B-rank Sound user perceives every vibration in the air as a single complex waveform they can decompose, filter, and reassemble. Can isolate a whispered conversation three blocks away from the city's noise. Can create a wall of sound: a sustained emission at frequencies that make the air in a corridor physically impassable — a standing wave pattern pushing back against anything that tries to move through it. Infrasonic weapons target specific organs — the resonant frequency of a lung, a heart, the fluid in the inner ear. The user's body has adapted: eardrums toughened, skull bone structure densified, and ultrasonic echolocation has become passive, always on. They know the shape of every room before they open their eyes.

A-rank. Sound as physics. An A-rank Sound user understands that sound is mechanical energy propagating through a medium, and every property of that propagation is theirs to set. Frequency, amplitude, direction, phase, interference patterns — all controllable simultaneously. Can create constructive interference at a distance: two waves meeting at a point and doubling amplitude, a pinpoint detonation at a target location with nothing between affected. Can create destructive interference: two waves meeting out of phase and canceling, total silence inside a hurricane of noise. The body as instrument becomes literal — every surface of skin can emit and receive, the entire body a transducer, spherical awareness of every vibration in every fluid medium. Other marks interact: a Lightning discharge's crack is caught, inverted, and returned as a subsonic pulse. A Fire user's roar is analyzed and canceled — the fire burning in absolute silence, and the silence is more disturbing than the fire.

S-rank. Regional acoustic dominion. An S-rank Sound user controls every vibration in every fluid medium within kilometers. Not hearing — owning. Every conversation, heartbeat, insect wing, wave breaking on a shore is a note in a symphony they are conducting. Can project a voice across a city as if standing beside each listener. Can weaponize the ambient sound of a location — background noise amplified to eardrum-rupturing levels. Can silence a battlefield — remove every vibration, and inside the silence soldiers fight where no blow has a sound, no order can be heard, no scream carries. In repose, the presence is the strangest of any expression: the room sounds better. Not louder, not quieter — clearer. Every voice distinct. Every word crisp. The ambient noise falling to a gentle background, and you do not understand why until you notice who is sitting in the corner and realize the acoustic architecture of the space has been curated.

SS-rank. Sound as cognition. An SS Sound user thinks in sound the way a sighted person thinks in images — a three-dimensional map of vibration extending for kilometers, updating continuously. They know the location, posture, heartrate, and emotional state of every person in range — the micro-tremor in a voice that means lying, the breath shift that means fear, the footstep rhythm that means about to run. Can create sounds without a source: a voice from an empty room, a scream from a wall, music from the air itself. Can resonate with structures — find the resonant frequency of a bridge, a fortress wall, and sing it. A literally held tone that matches the natural frequency and amplifies with each cycle until the structure shakes itself apart, stone cracking along grain lines, mortar turning to dust, a century's achievement undone by a sustained note the observer could barely hear.

Population context. SS Sound practitioners in the founding era were the intelligence networks. A single SS Sound user on a hilltop heard every conversation in the city below. The sealed archives describe one who sat in a lighthouse on the Delvren coast and heard plans discussed in an enemy fleet still three days from shore. The fleet arrived to find the harbor empty and the shore batteries aimed at the exact approach vector the admirals had agreed upon in a cabin with closed doors. The guild considers SS Sound extinct. The lighthouse still stands. Sailors who anchor near it on quiet nights report hearing voices inside — not words, just the sound of listening. The air hums at a frequency no instrument can identify.

SSS-rank. The practitioner is vibration — the principle by which mechanical energy propagates through fluid media, given a body. In their presence, the air is a communication medium of absolute fidelity, every molecule a carrier, every breath a potential message, every silence a choice to withhold. They hear the world the way the world hears itself — the harmonic vibration of every structure, the subsonic pulse of the planet's rotation, the ultrasonic whisper of molecules exchanging heat. A word placed into the vibration of a mountain's stone that echoes for centuries. A lullaby sung into a river's resonance that the water carries downstream and the fishermen hear at dawn and cannot explain. The human voice is the smallest thing they can do, and the most devastating — a voice that can reach anyone anywhere with absolute clarity, arriving not through the ears but through the body, the ribcage a resonating chamber, the skull a sounding board, the bones conducting what the air carried. The listener does not hear the word. They feel it, the way a bell feels the hammer.

Population context. SSS Sound existed in the founding era. The sealed archives do not record what they said. They record what the world still says back: caves in the Vetharan Isles where the walls hum with a tone that has persisted for thousands of years without energy source, as if the rock was once asked to hold a note and has been holding it ever since, waiting for someone to come back and say when to stop.

Not to be confused with:

Writer's crib:

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