dungeons and dragons notes part 9: the grand chasm
the book of vile darkness, as previously discussed, erodes surfaces upon which it is placed without respect for material, given enough time to do so. there is no limit to this effect, and so the demithurugn (an theological manuscript from an early moth civilization with similar properties as a book of vile darkness [possibly the work upon which such books were originally based]) now resides at the bottom of the grand chasm, a miles-deep pit in the world. the scroll has not been removed from this place because the wards placed upon it by the moths hold strong, but some explorers venture into the depths to copy its wisdom into their own notes.
the pit itself descends about five miles into the land, but continues to deepen every year. the pit is connected to multiple cave systems, possibly produced by the demithurugn, the topmost of which (within a mile of the surface) are largely inhabited by mundane animals. going deeper (between the end of the first mile and the beginning of the fourth) a surprising quantity of Beastes can be found, though they appear to be based off of subterranean creatures, which is abnormal for such entities.
the bottom layer is profoundly unstable, and rockfalls are frequent, as are planar breaches to the abyss. it is in places infested with demons, and otherwise devoid of life entirely.