Squeaking Immaculus (Sponge Demon)

Devils (usually) live in the cavernous bowels of Hell, but demons are another thing entirely: mutated spells with psychoplasmic bodies.  The Squeaking Immaculus, or sponge demon, is produced from Randolph’s abrasive cleanser, which doesn’t find much use among dungeon delvers for some reason.

The biggest trouble with Squeaking Immaculi is that they can hold all kinds of liquids, including potions, for later use. The second biggest trouble is that they’re clever enough to use this to their full advantage, turning invisible at a moment’s notice and crawling up the walls with a potion of spider climb to make an unseen attack from above, or spraying the party with oil and then using a potion of fire breath on its next turn.

When it comes to sponge demons, oozes count as “liquid” and may be soaked up (and spewed out) like anything else, which makes them indispensable to alchemists (whose experiments can produce oozes when they go wrong).

Rules for the Squeaking Immaculus, and for Randolph’s abrasive cleanser, below the cut.


Squeaking Immaculus
HD 6 HP 21 Morale 10 Defense -2 Move 1/2 normal Save +10
1d4 bludgeon or Special liquid spray (see below)

Loot: A sponge demon’s lair will have 3d6 random potions. Someone with alchemical equipment and experience can render a sponge demon’s body down to extract its liquids in a usable form (20% chance that two of the liquids merge into a new potion with combined effects). A sponge demon’s body is worth 1g to an alchemist or anyone else with the ability and desire to render the corpse into materials suitable for scrubbing down alchemical equipment. As a curiosity, it is worth 50s to any interested collector, or 3g if the body was undamaged by the battle (which may require creative tactics) and preserved soon afterward, and the PCs made an effort to find someone willing to pay top coin for a perfect specimen.

Spongiform: Whenever Squeaking Immaculus would be affected by a liquid (including potions), it may choose to absorb the liquid instead. On its turn, Squeaking Immaculus may use as many stored liquids as it likes and/or spray a stored liquid. It may choose to spray a concentrated burst at one person within 30′ (treat as a normal ranged attack) or spray a 15′ cone. The latter allows all targets to Save vs Breath to halve the damage, effect, or duration (whichever makes the most sense). Squeaking Immaculus can hold a number of “doses” equal to its HD.

If the sponge demon sprays the ooze in a cone then the ooze dies, but every target in range is affected as though the ooze had attacked them once (Save vs Breath to halve the damage, add an additional turn before the green slime starts to eat you alive, or whatever else makes sense for this kind of ooze).

If found “in the wild” (i.e. doing its own thing, without someone to supply it with a specific loadout), then give the Squeaking Immaculus 1d6-2 potions from Alchemy and Oozes and fill the rest of its slots with acid (deals 1d6 damage).

A Squeaking Immaculus which has been sent by the Clean God will probably have HD 6 (as above) and the liquids listed below. The Clean God uses them as wizard killers, hence the spell-capture potion  and spell ward potion. With its HP and Save, the sponge demon doesn’t have to worry about being taken out in one shot (especially when its prey are typically just students), so a better tactic is to open up with emetic potion to disable its prey.

  • 2 doses of acid (1d6 damage each).
  • Emetic: As the spell purgation: Target violently expels the contents of their stomach and bowels as they cramp and spasm, suffering 1d4 damage, and suffer agony (if Save was successful, then cut agony damage in half, rounded down, before applying ‘turns elapsed’ reduction). Looks like syrupy water. Smells like sugar.
  • Hate: You hate the first person you see after drinking this potion. You must succeed on a lawful CHA roll to avoid attacking them whenever you see them. When you attack them, you fly into a Rage (as barbarian). Permanent. Smells like yellow bile.
    • The Squeaking Immaculus will use this upon making contact with its target, to ensure that it carries out its duty.
  • Spell-Capture: Until your next turn, you may choose to “capture” a spell when it is cast. It is stored like a liquid but is cast as a normal form of that spell, with [dice] equal to the number used when initially casting it. Looks and smells like herbal soup.
  • Spell Ward: The next spell that targets you fails. Looks like milk. No smell.

Randolph’s Abrasive Cleanser

R: 30′ T: single contiguous surface D: instant

5′ x [sum] of the surface (i.e. floor, wall, chair) is instantly cleansed of all dirt, stains, etc. For the next [dice] rounds, it gleams brightly under light and has a pleasant, citrus-y sort of smell. If cast on a living being, then they take 1 x [dice] acid damage as soapy burns appear across their skin.


My hope is to turn the sponge demon into something that can be quite worrying to PCs, for all that it’s a misshapen Spongebob. The PCs can never be sure what potions this sponge demon has up its sleeve, but if they’ve encountered one before then they can be sure that it’s durable, determined, and clever.

I’ve altered purgation a little, as you can see if you follow the first link under “emetic potion.”


I haven’t used Randolph’s Abrasive Cleanser. I used the sponge demon in place of the gore demon during a Wizard University delve (cr. to Martin O of Goodberry Monthly), and instead of attacking them in the bathroom it waited until they reached the flooded portion of the steam tunnels, then sprayed most of the party with an emetic, and dragged a PC into the water. It was fought off, but proved to be a long-running source of fear, especially when it came time to head back through the steam tunnels again on the way out. 

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