The following account was recorded in the agent's log during your transmission: A ravaged, subterranean cathedral lies in shambles, its stone pillars cracked, and intricate, gothic carvings worn away by some unseen force. Like, a noxious, acidic sludge seeps through the stone, corroding the metallic components of a massive, fossilized entity – an ancient biomechanical heart – that's impaled by twisted, crystalline shards. Umm, the air reeks of decay and burning oil, the flickering, yellowish light filtering through a partially-collapsed entrance that's letting in a torrent of frigid, sleet-filled air, as if it's snowing above ground... but somehow the sleet's coalescing into liquid metal.