A darkmantle's life cycle is swift-young grow to maturity in a matter of months, and most die of old age after only a few years. As a result, generations of darkmantles quickly accrue, and over the years the evolution of these creatures is similarly swift. In this manner, a cavern's ecosystem can have a significant effect on a group of darkmantles' appearance, abilities, and tactics. Aquatic caverns might develop darkmantles that can swim, while those beset with volcanism might generate darkmantles with a resistance to fire. Other darkmantle variants might develop much stonier hides, and instead of swooping down to crush prey might simply drop and pierce them through with their stalactite-like lengths. The deepest, darkest caverns are rumored to host darkmantles of incredible size, capable of smothering multiple human-sized foes at once in their leathery folds.