Caged
It was full of empty spaces, this part of Hell. There was no color. No black abyss, no blinding white light. No green grass or dead orange leaves on the ground, no blue skies or rain that fell. There was no ground to stand on, no sky to look at. No sun for clouds to obscure. It was complete nothingness, and Sam had never felt so alone, or so exposed.
It's strange, the feelings that nothingness can stir within a soul. He tried to find his arms or his legs, but he couldn't. He could see the nothingness around him. He could scream. He could hear Adam and Lucifer and Michael, but he couldn't tell where they were. He heard an exceptionally loud silence from Adam, constant, hateful and unbroken. He could hear the shades of Michael's anger, and the depth of Lucifer's pain.
That's what this hell was; everything encompassed by nothingness. It was the worst kind of torture; the torture one will inevitably inflict upon himself. Sam hated himself more than he ever had.
More than when his father died without knowing that Sam was sorry.
More than he had when Dean went to Hell and Sam couldn't stop it.
More than when Jess had died because of him.
He heard their voices in his head, taunting him. John spoke softly of how he always knew how much of a monster Sam was. Dean's voice cut like a knife, asking Sam why he had betrayed him, telling him that this sacrifice would never make up for what he had done. Jessica's voice caressed him like poison. You watched me burn. You moved on. You never loved me, did you?
Sam would have cried, but tears didn't exist in this part of Hell. So Sam settled on nothing, growing further apart from his soul every day, every year, and every decade. Time crawled in this part of hell; a month wasn't ten years. A month was a thousand. By the time Sam was pulled out, his soul wasn't a part of him anymore. But it was still half of the old Sam, trapped in hell. Enduring every day the echoing of the voices of past betrayals.
And so the monster that is Sam walks the earth. When he gets put back together again, who knows what he'll do? After all, this special Hell shaped the Devil himself.