A strange cavern...

Silence. Darkness. Discontinuity. And then, some unknown about of time later, light.

You groan and open you eyes, rolling over onto your back. It's harder than you expect, something wet and sticky seems to be trying to hold you to the floor. Ugh. Not a good sign when waking up in an unknown place. Weirdly you don't feel hungover, though. What's the last thing you can remember?

...Oh.

The memory of that green light filling your universe returns, and suddenly you don't feel sleepy at all. You scramble to your feet as an icy rush of adrenaline fills your veins. Where are you? You look around and suddenly wish you hadn't. Some horrible alleyway would have better.

It's a cavern, or may some sort of underground ravine, the roof vanishing into darkness above. The walls are made of slimy pink rock smoothed into sinuous curves and whorls. Dim light filters in from one direction. Looking that way you can see a forest of black... somethings sprouting from the ground. They look like trees but without branches or leaves, and they seem to grow from the walls as much as the floor. This really doesn't resemble any cave you've ever seen, it seems almost... organic...

You wish you hadn't thought that. You really, REALLY wish you hadn't thought that. Because now you look at the slimy pink walls again, they don't look much like rock at all. They look like flesh. Horror creeps slowly up your spine. Whatever this place is, it's alive.

Suddenly you hear a voice. It thunders from all around you, echoing and resonating bizarrely. Almost like you're inside the person speaking. To your shock, though, you realize you recognize it...