You are lying on your back on what feels like very smooth, cold, stone. High above you is an expansive ceiling, support beams running up to and along it like rigid snakes. The ceiling is also made of stone, slightly peaked as though a rooftop. There are several glass windows, placed at intervals along the ceiling, but all they reveal of the outside is darkness. It must be night.
Sitting up, you give further examination to what's beneath you. You are indeed lying on stone: a slab of marble, to be exact. It rests on a rectangular pedestal, almost like some sort of altar. To your left and right are two flaming braziers, providing twin sources of heat. A curious scent like incense is wafting from them, making you almost want to sneeze. You push yourself off the slab of marble, feet hitting the floor with a sound that seems unnecessarily loud in the still of the room. The floor is polished white marble, and looks spotless. The walls are (surprise) stone as well, rising up to meet the ceiling and an impossibly tall height. Patterned ridges go along them, almost as though the room were one giant sculpture.
The altar you woke up on is a curious thing, the pedestal portion of it covered in flowing designs. They swirl and twist along it like waves, even around the sides. Faces emerge from the flowing lines, snarling, fang-filled mouths and large, bold eyes that seem to stare at you incriminatingly. You take a step back, looking around the room, and come to a solid conclusion.
This . . . is not where you went to sleep last night.
The quiet murmur of voices reaches you, and for a moment, you are unable to pinpoint its location due to the acoustics of the room. Listening intently, you slowly turn and face the far wall. Embedded in the stone is a door that you never really noticed before, a dark metal with braces and bolts through it. On the door, a large D is formed from small red stones that could be either garnets and rubies. You take a step closer to that door, hearing the voices get louder, as though an argument were taking place. A thick handle is placed on the door, as if waiting for you to open it.
What do you do?