You hold the tin in your hands, the metal cold and unyielding against your palms, and the smell of it cuts through the damp air of the trench like a blade. It is not food, not truly, but a thick, dark paste that smells of burnt sugar and sulfur, a concoction that the men in the rear called the Black Balm. You are a soldier, or you were, before the world turned strange and the line between the living and the dead dissolved into gray mist. Now you are a guard at the perimeter of the city, a place that should have been a metropolis of glass and steel but is instead a graveyard of brick and bone. The year is 1918, or perhaps 1940, or maybe it is no year at all; time has become a slippery thing, like water pouring through your fingers.

Your comrade, Thomas Bradshaw, sits across from you in the dugout. He is a small man, precise in his movements, with eyes that do not blink often enough. He holds a similar tin, but his is empty. He has been saving his ration for three days, he says, though you know he is lying. Thomas is the one who brings the rumors, the ones that make the hair on your arms stand up. He says the enemy is not soldiers. He says the enemy is a sickness that eats from the inside out, a rot that turns men into things that mimic human speech but lack the warmth of a soul. You do not believe him. You are a man of duty, of structure, of clear lines between right and wrong. You are a subordinate to the order of the day, and the order of the day is to hold the line.

But the line is bleeding.

You have seen them, the things that crawl up from the sewers of the city. They look like men, wearing tattered uniforms, but their skin is translucent, and beneath it, you can see the black veins pulsing. They do not scream. They whisper. They whisper your name. They whisper the names of your family, of your past, of the regrets you have buried so deep you forgot they were there. You have killed three of them with your rifle. The bullets pass through them as if they are smoke, but the noise, the impact, causes them to freeze. It is a trick, a distraction. While they are frozen, you can drive your bayonet into their chests, and they dissolve into a puddle of that same black, sulfuric sludge.

The tin in your hand grows heavier. You open it. The paste is thick, viscous. You bring it to your lips. It tastes of iron and old blood. You swallow. For a moment, the pain in your joints, the ache in your bones, the fear that has been a constant hum in your head, it all vanishes. You feel strong. You feel clear. You feel like a soldier again.

Thomas watches you. His eyes are wide, not with fear, but with a terrible recognition. He does not speak. He simply looks at you, and in his gaze, you see a mirror. You see yourself, but stripped of the uniform, stripped of the duty, stripped of the lie that you are protecting the city. You are not protecting the city. You are feeding it.

The superstructure of the war is crumbling. The generals, the officers, the men in the rear who send the orders, they are gone. Or they are one of them. There is no difference anymore. The city is a single organism, a vast, breathing thing made of stone and flesh, and you are a cell in it. A healthy cell, for now. But cells die. Cells rot.

A whistle blows. It is the signal for the assault. You close the tin and tuck it into your pocket. You pick up your rifle. The metal is warm now, as if it has absorbed your body heat. You step out of the dugout into the fog. The fog is thick, white, and smells of ozone. The street ahead is empty. Or so it seems.

You hear a sound. A scraping sound, like nails on wood. It comes from everywhere and nowhere. Then, from the fog, a figure emerges. It is wearing the uniform of a major, a rank you have never met in this unit. The face is pale, the eyes black pits. It holds a tin in its hand, identical to yours. It extends the hand toward you.

You lower your rifle. You do not know why. The instinct that has guided you, the primal, instinctual bond with Thomas, the friendship that has held you together in the dark, it is pulling you away from the weapon. You want to help this man. You want to give him the tin. You want to share the strength, the clarity, the peace.

You step forward. The Major takes the tin from your hand. Its fingers are cold, dry, like paper. It smiles, and its teeth are made of glass. It opens the tin and eats. The sound it makes is not chewing, but a wet, sucking noise, like a vacuum. The black paste vanishes from the tin, but the tin itself begins to crack. The metal turns to ash, and the ash drifts into the fog.

The Major does not dissolve. It stands there, solid, real. It looks at you, and for the first time, you see a soul in its eyes. It is not a monster. It is a man. A man who has been holding the line for a century. A man who has eaten the Balm not for strength, but to keep the hunger away. To keep the thing inside him from breaking out.

You realize then that the Balm is not food. It is a cage. It binds the rot to the flesh. It keeps the disease contained. Without it, the man becomes the thing. The thing is not an enemy. The thing is the result of failure. The result of giving in to the fear.

You look down at your empty hands. You have no more Balm. You never did. The tin in your pocket was empty from the start. The taste in your mouth was an illusion, a phantom limb of the mind. You have been eating nothing but fear for weeks.

Thomas is behind you. You hear his footsteps, quick and erratic. You turn. He is running at you. His face is twisted in a snarl, his eyes wide and black. He is not holding a rifle. He is holding a knife.

"Give it to me," he says. His voice is not his own. It is a chorus of whispers, the same whispers you have heard from the things in the fog. "Give it to me, or I will make you."

You look at him. You see the friend you have known for two years. You see the man who shared his last cigarette with you. You see the man who held your hand when your brother died. And you see the rot, creeping up his neck, turning his skin to translucent gray.

You do not raise your rifle. You do not run. You step forward, into the path of the knife. You open your arms. You offer yourself.

Thomas hesitates. The knife trembles in his hand. The chorus in his voice falters. For a second, the fog lifts, and you see the city for what it is. Not a battlefield, but a hospital. A place where the sick are kept. And you are not a soldier. You are a patient. And Thomas is not a friend. He is a doctor who has gone mad with the weight of his own illness.

The knife falls. Thomas collapses to his knees, weeping. The rot recedes, just slightly, from his face. He looks up at you, and his eyes are clear again. Human.

"I'm sorry," he says.

You reach down and pick up the tin from the ground. The one the Major dropped. It is full. The black paste is there, thick and dark.

You look at Thomas. You look at the fog. You look at the city, the vast, breathing organism that has consumed so many. You understand now. The line between good and evil is not a wall. It is a membrane. It is permeable. It is thin. And it is in your hands.

You could give him the tin. You could save him. You could keep the line.

Or you could let him go.

The instinct, the primal, beyond-reason bond, screams at you to save him. To hold him. To keep him from the dark.

But you are a soldier. And the order of the day is to let go.

You place the tin in Thomas’s hands.

He looks at it, then at you. He nods.

He stands up, and he walks into the fog.

You do not follow. You stand in the clearing, the silence pressing against your ears. The fog begins to thicken again, swallowing the street, swallowing the past. You feel the hunger in your stomach, a hollow, aching void. You have no more Balm. You have no more strength.

But you are free.

The pain comes back. The ache in your bones. The fear. It is a weight, a burden, a thing you must carry. You do not fight it. You do not run from it. You accept it.

You sit down on the cold ground, and you wait.

The city breathes.

You breathe with it.

And in the distance, a whistle blows, and the sound fades into the gray, and you are alone, and you are whole, and you are gone.