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Algae Bloom

Small ooze, unaligned

AC
8
HP
58
Speed
10
CR
1/2

A drifting mat of green murk that thickens where mill runoff slows. It sours the water around it and leaves swimmers coughing and rubbing their eyes.


Armor Class 8 (soft mass)

Hit Points 58 (9d6 + 27)

Speed 10 ft., swim 20 ft.


STR
10 (+0)
DEX
6 (-2)
CON
16 (+3)
INT
1 (-5)
WIS
6 (-2)
CHA
1 (-5)

Damage Resistances poison

Condition Immunities blinded, poisoned

Senses blindsight 30 ft. (blind beyond this radius), passive Perception 8

Languages —

Challenge 1/2


Traits

Cloud the Water. As a bonus action, the bloom thickens the water in a 10-foot cube centred on itself. That area is heavily obscured until the start of the bloom's next turn.

Amorphous. The bloom can move through a space as narrow as 1 inch wide without squeezing.

Actions

Sickening Touch. Melee Attack Roll: +2, reach 5 ft., one creature. Hit: 7 (2d6) Poison damage, and the target must succeed on a DC 13 Constitution saving throw or be poisoned until the end of its next turn.

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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