Mnemonic Compost Heap
Armor Class 14 (natural armor)
Hit Points 114 (12d10+48)
Speed 20 ft. climb 20 ft.
Saving Throws Con +7, Wis +5
Skills History +3, Perception +5
Damage Resistances acid; cold; fire
Damage Immunities poison
Condition Immunities blinded, charmed, deafened, exhaustion, frightened, poisoned, prone
Senses blindsight 60 ft., passive Perception 15
Languages Common, telepathy 30 ft.
Challenge 5 (1,800 XP) Proficiency Bonus +3
Actions
Bonus Actions
Reactions
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"You called it waste. We remember being loved." — the heap beneath Bellwether Abbey
Lore & Description
Appearance
A Mnemonic Compost Heap is a towering mound of black-brown humus, steaming vegetable fibers, broken crockery, animal bones, and pale rootlets. Faces occasionally press outward from its wet surface: a carrot's knotted impression, the skull of a chicken, the eye of a fish, or the smiling likeness of someone who once sat at a dinner table. It smells simultaneously of fresh bread, rain-soaked earth, old blood, and the favorite meal of whoever stands nearest.
Behavior & Origins
A Mnemonic Compost Heap forms when a site of communal meals, mass burial, or ritual offering is fed with grief, neglect, and too many unspoken names. It is not mindless decay; every morsel within it retains a fragment of experience, and the heap speaks in a chorus of remembered tastes. The heap beneath the abandoned kitchens of Bellwether Abbey calls itself the Last Supper and wants the living to acknowledge every person whose remains were thrown into its garden without rites. A character can weaken it by investigating the heap's contents, recalling its origins, and speaking those truths aloud.
Running Mnemonic Compost Heap
Tactics
The heap opens with Hungry Recollection to stun and disorient clustered foes, then uses Burial Surge to divide the party and restrain anyone who tries to flee. It focuses its tendrils on creatures that have identified its ingredients, because those attackers can truly hurt it, while using Turn the Heap to trample past those who cannot. When reduced below one-third of its hit points, it retreats toward rich soil or a corpse and fights to the death if someone has begun naming the forgotten dead.
DM Tips
- Telegraph the creature's defense with scraps that whisper names and attackers' blows sinking harmlessly into the mound; reward investigation, food lore, or compassionate questioning with clues about its contents.
- Give the heap multiple voices: a grandmother describing stew, a frightened hen, a child remembering an apple, and a priest reciting burial names, often interrupting one another.
- For a weaker party, lower Hungry Recollection to 3d8 damage and reduce the recognition DC to 13; for a stronger party, let the heap remember a character's favorite meal and impose disadvantage on that character's first recognition check.
Loot
- The Abbey's Last Seed — A warm, pearl-sized seed recovered from the heap. Planted in consecrated soil, it grows into a fruit tree whose first harvest reveals a forgotten person's final memory.
- Bone-Handled Serving Spoon — A blackened spoon bearing the initials of Bellwether Abbey's missing cook. It acts as proof of the heap's origin and can be used to address it with advantage on one recognition check.
- Jar of Remembered Aroma — A sealed clay jar containing the scent of a specific lost meal. Opening it grants advantage on checks to identify the heap's remembered ingredients, but also summons a brief, mournful whisper from the dead.
