Twilight of an Age
“Living dungeons” rise spontaneously from beneath the underworld, spiraling wildly upward toward the surface where they will become permanent features should they breach the surface. They don’t correspond to any logical design since they are simply the result of ill-intended magic.
Some adventurers try to destroy these living dungeons before they breach. Some living dungeons can be slain by eliminating all their monsters. Some must be slain in other fashions, such as through the use of specific magic rituals meant to shatter their crystalline hearts. The components and instructions for slaying a living dungeon are usually found within the dungeon itself, leading some adventurers to speculate that the dungeons want to die.