Heaven's Trap

She doesn't know how they got here, but she knows this place.

"Doc?" She hears Graham ask, but it's distant now. Her skin is on fire, she's burning up, her flesh is charred and she can feel it's hands on her, it's breath in her face, and the buzz of flies-

"Right." She turns around, a painfully fake smile plastered on her face. "Let's get a shift on. I know this place too well."

She does. She knows how the walls move, how the rules work here. And she sees the portrait of Clara-she can remember now, the regeneration knocked a few things back into place-hanging on the wall, cracked and old.

4.5 billion years old.
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The TARDIS team end up in a place the Doctor has wanted to forget. Is it a replica? Or is there something more at work here? The Doctor must fight her growing terror over the situation, as the past is thrown into her face.
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Rated M to be safe since there are themes of PTSD, violence, etc.