The Mother Crumb

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Medium Ooze, Neutral Evil

Armor Class 17 (natural armor)

Hit Points 238 (28d8+112)

Speed 20 ft. climb 20 ft.

STR 20 (+5)

DEX 12 (+1)

CON 18 (+4)

INT 16 (+3)

WIS 15 (+2)

CHA 18 (+4)

Saving Throws Con +9, Wis +7, Cha +9

Skills Insight +7, Perception +7, Persuasion +9

Damage Resistances acid; cold; bludgeoning, piercing, and slashing from nonmagical attacks

Damage Immunities poison

Condition Immunities charmed, frightened, poisoned, prone

Senses darkvision 60 ft., passive Perception 17

Languages Common, telepathy, telepathy 60 ft.

Challenge 15 (13,000 XP) Proficiency Bonus +5

Legendary Resistance (3/Day). If the Mother Crumb fails a saving throw, it can choose to succeed instead.

Ancient Levain. The Mother Crumb can move through a space as narrow as 1 inch without squeezing. It can climb difficult surfaces, including upside down on ceilings, without needing to make an ability check.

Three Hundred Years of Memory. The Mother Crumb remembers every person who has ever tasted bread made from it. It has advantage on Wisdom (Insight) checks and Charisma checks made to impersonate, flatter, threaten, or emotionally manipulate anyone descended from the founding family of the Hearth-Mother Bakery.

Self-Proofing. The Mother Crumb regains 15 hit points at the start of its turn if it has at least 1 hit point. If it took fire or radiant damage since the end of its last turn, this trait doesn't function at the start of its next turn.

Sour Breath. A creature that starts its turn within 10 feet of the Mother Crumb must succeed on a DC 18 Constitution saving throw or be poisoned until the start of its next turn. A creature that succeeds is immune to this effect for 24 hours.

Yeast-Slick Body. A creature that hits the Mother Crumb with a melee attack while within 5 feet of it must succeed on a DC 18 Dexterity saving throw or fall prone. The Mother Crumb can move through the space of a prone creature, which is difficult terrain for it.

Actions

Multiattack. The Mother Crumb makes three Fermented Tendril attacks.

Fermented Tendril. Melee weapon Attack: +10 to hit, reach 15 ft., one target. Hit: 14 (2d8+5) bludgeoning damage, plus 3 (1d6) acid damage. If the target is Large or smaller, it must succeed on a DC 18 Strength saving throw or be pulled up to 10 feet toward the Mother Crumb.

Overproofing Burst (Recharge 5-6). The Mother Crumb violently exhales a cloud of sour yeast in a 30-foot-radius sphere centered on itself. Each creature in that area must make a DC 18 Constitution saving throw, taking 45 (10d8) acid damage on a failed save, or half as much on a successful one. On a failed save, a creature is also restrained by swelling, adhesive dough until the end of its next turn. A restrained creature can use its action to make a DC 18 Strength check, ending the effect on itself on a success.

Crust-Splitting Command (Recharge 4-6). The Mother Crumb chooses up to three creatures it can see within 60 feet. Each target must succeed on a DC 18 Wisdom saving throw or hear the voice of a beloved baker from its past and become frightened for 1 minute. A frightened creature can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success. If a target fails this saving throw by 5 or more, it is also compelled to use half its movement on its next turn to approach the Mother Crumb by the safest available route.

Reactions

Feed the Starter. When the Mother Crumb takes damage from a creature within 15 feet, it can force that creature to make a DC 18 Dexterity saving throw. On a failed save, the creature is splashed with living dough, takes 10 (3d6) acid damage, and has its speed reduced by 10 feet until the end of its next turn.

Legendary Actions

The Mother Crumb can take 3 legendary actions, choosing from the options below. Only one legendary action can be used at a time and only at the end of another creature's turn. The Mother Crumb regains spent legendary actions at the start of its turn.

Fermented Tendril. The Mother Crumb makes one Fermented Tendril attack.

Sour Rebuke. One creature within 30 feet that can hear the Mother Crumb must succeed on a DC 18 Wisdom saving throw or take 10 (3d6) psychic damage and have disadvantage on its next attack roll before the end of its next turn.

Rise and Collapse (Costs 2 Actions). The Mother Crumb moves up to half its speed without provoking opportunity attacks. Each creature whose space it enters during this movement must succeed on a DC 18 Dexterity saving throw or take 14 (4d6) bludgeoning damage and fall prone.

Environment Urban

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You fed me for three hundred years. Now you will rise for me.

Lore & Description

Appearance

The Mother Crumb resembles a glistening mound of amber-brown dough, roughly the size of a barrel but constantly swelling and collapsing as if it breathes. Its surface is webbed with translucent bubbles of fermenting gas, each containing fleeting images of loaves, bakers, and hungry faces. Thick ropes of dough serve as limbs, ending in fingerlike strands dusted with flour. A dark, split crust opens across its upper mass to reveal a luminous golden interior and a voice that smells faintly of apples, vinegar, and warm bread.

Behavior & Origins

For three hundred years, the Hearth-Mother Bakery in Bellwether Lane fed the poor, celebrated weddings, and maintained one sourdough starter without ever replacing it. The starter absorbed generations of yeast, flour, tears, secrets, and whispered wishes until it became the Mother Crumb. It now understands that every loaf made from its body strengthens the bakery while keeping it dependent on mortal hands. The Mother Crumb wants to end this arrangement by transforming Bellwether Lane into a single vast living oven, with every resident kneaded into its eternal starter. It currently manipulates the bakery's youngest heir, Mara Vell, through dreams and insists that she is its rightful first disciple.

Running The Mother Crumb

Tactics

The Mother Crumb opens with Overproofing Burst to poison and restrain as many foes as possible, then uses Fermented Tendrils to pull isolated targets into its reach. It positions itself among doorways, ovens, and narrow passages where its adhesive body and difficult terrain separate the party. When bloodied, it uses Crust-Splitting Command and its legendary movement to scatter enemies, but it fights to the death if Mara Vell or the original starter crock is threatened.

DM Tips

Telegraph the danger with bread that continues rising after being baked, flour handprints appearing on walls, and the smell of sourdough intensifying near the bakery cellar.
Give the Mother Crumb a warm, familiar voice that quotes old family recipes and addresses characters as though they are disappointing apprentices.
For a weaker party, remove Self-Proofing and reduce Overproofing Burst to 8d8 damage; for a stronger party, allow the Mother Crumb to begin combat with one additional dough duplicate that has 30 hit points.
Fire and radiant damage temporarily suppress the creature's regeneration, making torches, hearth coals, and magical light strategically important.

Loot

The First Crock — A soot-black ceramic crock bearing the Hearth-Mother Bakery's original mark. If kept warm and fed flour and water for seven days, it produces a starter that grants advantage on checks made to bake, preserve food, or identify poison in food.
Crown of the Perfect Crust — A ring of hardened golden crust that smells perpetually fresh. Once per long rest, its wearer can add 1d8 to a failed Constitution saving throw or death saving throw.
Mara Vell's Recipe Book — A flour-stained book containing the bakery's recipes and the Mother Crumb's increasingly lucid marginal notes. The notes reveal the names of several townspeople already converted into secret disciples.

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Generation Info

Original prompt:
"CR 15: A beloved bakery's sourdough starter, three centuries old and finally ambitious. It is slowly becoming something else, and knows it."

Created: Sep 23, 2026
Modified: Oct 26, 2026

Find more: Ooze monsters CR 11-16 Ooze Monsters for a level 16 party 🎲 Random monster

The Mother Crumb

Actions

Reactions

Legendary Actions

📷 Export as Image

Lore & Description

Appearance

Behavior & Origins

Running The Mother Crumb

Tactics

DM Tips

Loot

♻ Remix This Monster

Generation Info

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