Shambling Mound
A shambling mound, sometimes called a shambler, trudges ponderously through bleak swamps, dismal marshes, and rain forests, consuming any organic matter in its path. This rotting heap of animated vegetation looms up half again as tall as a human, tapering into a faceless "head" at its top.
A shambling mound feeds on any organic material, tirelessly consuming plants as it moves and devouring animals that can't escape it. Only the shambling mounds' rarity and plodding speed prevent them from overwhelming entire ecosystems. Even so, their presence leeches natural environments of plant and animal life, and an unsettling quiet pervades the swamps and woods haunted by these ever-hungry horrors.
Composed of decaying leaves, vines, roots, and other natural swamp and forest compost, shamblers can blend into their environs. Because they move slowly, they rarely attempt to pursue and catch creatures. Rather, they remain in place, sustaining themselves by absorbing nutrients from their surroundings as they wait for prey to come to them. When a creature passes near or alights upon a shambling mound, the monster comes to life, seizing and absorbing the unwary prey.
A shambling mound results from a phenomenon in which lightning or Fey magic invigorates an otherwise ordinary swamp plant. As the plant is reborn into its second life, it chokes the life from plants and animals around it, mulching their corpses in a heap around its roots. Those roots eventually give up their reliance on the soil, directing the shambling mound to seek out new sources of food.
The instinct that drives a shambling mound is its central root-stem, buried somewhere inside its ponderous form. The rest of a shambler consists of the rotting heap that it simultaneously accumulates and feeds on, which protects the root-stem and animates to smash and smother the life from any creature.
The dense mass of a shambling mound's body shrugs off the effects of cold and fire. Lightning reinvigorates the root-stem, strengthening the shambling mound and bolstering its consumptive drive.
Despite its monstrous form, the shambling mound is a living plant that requires air and nourishment. Although it doesn't sleep the way an animal does, it can lie dormant for days on end before rising to hunt for food.
If a shambling mound faces defeat before an overwhelming foe, the root-stem can feign death, collapsing the remains of its mound. If not subsequently killed, the root-stem beds down in the shambler's remains to slowly regrow its full body, then once again sets out to consume all it can. In this way, shambling mound infestations long thought destroyed can recur time and again.
Geographic Distribution
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