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Culvert Ooze

Large ooze, unaligned

AC
13
HP
123
Speed
20
CR
4

Something got into the storm drains below the locks and learned the shape of pipes. It waits where the brick narrows, patient as sediment, and what goes in as a skiff scraper comes out as a stain.


Armor Class 13 (flexible membrane)

Hit Points 123 (13d10 + 52)

Speed 20 ft., climb 20 ft., swim 20 ft.


STR
16 (+3)
DEX
6 (-2)
CON
18 (+4)
INT
3 (-4)
WIS
8 (-1)
CHA
3 (-4)

Saving Throws Con +6

Damage Resistances acid

Condition Immunities blinded, charmed, frightened, prone

Senses blindsight 30 ft., passive Perception 9

Languages —

Challenge 4


Traits

Squeeze. The ooze can move through a gap 1 foot wide without squeezing and can enter a hostile creature's space.

Clog (Recharge 5–6). When a creature within 5 feet hits the ooze, the ooze folds around the blow. That attacker is restrained until the end of its next turn.

Actions

Multiattack. The ooze makes two pseudopod attacks.

Pseudopod. Melee Attack Roll: +5, reach 10 ft. Hit: 14 (2d10 + 3) Bludgeoning damage plus 3 (1d6) Acid damage.

Engulf. One Large or smaller creature in the ooze's space must succeed on a DC 14 Constitution saving throw, taking 14 (4d6) Acid damage and being grappled (escape DC 14) on a failed save, or half as much damage and no grapple on a successful one.

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Further reading

Jetpack7 Game Master Series
The Game Master's Book of Random Encounters
Jeff Ashworth · 2020
The Game Master's Book of Traps, Puzzles and Dungeons
Jeff Ashworth · 2022
The Game Master's Book of Legendary Dragons
Aaron Hübrich · 2022