You step inside, your boots crunching on loose gravel. The familiar drip of water echoes from somewhere deep within. Normally, by now, you'd hear the clatter of a skeleton's bones, the hiss of a spider, the groans of a zombie shuffling through the darkness.

You hear nothing.

The tunnel stretches ahead, empty and silent. You walk deeper, past abandoned minecart tracks and veins of coal glinting in the dim light. The silence is oppressive. A bat screeches and flutters past your head, but that's it. No scrabbling claws. No rattling bones.

You round a corner into a larger chamber. A lava fall spills down one wall, casting flickering orange light across the cavern. And in that light, you see them. A cluster of zombies, cowering against the far wall. Their green flesh is trembling. Their arms are raised as if to ward off a blow. They aren't looking at you. They're looking past you.