Bog Scum

This thick green blob lays on top of the water, devouring everything it touches.

Bog Scum CR 13

XP 25,600
N Huge ooze (aquatic)
Init -2; Senses blindsight 120 ft.; Perception -1


AC 6, touch 6, flat-footed 6 (-2 Dex, -2 size)
hp 232 (16d8+160)
Fort +14, Ref +3, Will +4
Defensive Abilities ooze traits; Immune acid, slashing and piercing damage; Resist cold 5
Weaknesses vulnerable to fire


Speed 40 ft., climb 20 ft., swim 40 ft.
Melee slam +18 (2d6+4 plus 2d8 acid and grab)
Space 15 ft.; Reach 10 ft.
Special Attacks constrict (2d6+4 plus 2d8 acid)


Str 26, Dex 7, Con 29, Int 5, Wis 8, Cha 1
Base Atk +12; CMB +22 (+26 grapple); CMD 30 (34 vs grapple, can’t be tripped)
Skills Swim +24
Feats Cleave, Great Cleave, Improved Natural Attack (slam), Power Attack, Toughness, Vital Strike
SQ amphibious, sticky


Acid (Ex)

The bog scum secretes a digestive acid that dissolves organic material and metal quickly, but does not affect stone. Each time a creature suffers damage from a bog scum’s acid, the creature’s clothing and armor takes an equal amount of damage from the acid. A DC 25 Reflex save prevents damage to clothing and armor. A metal or wooden weapon that strikes the bog scum takes 2d8 acid damage unless the weapon’s wielder succeeds on a DC 25 Reflex save. If the bog scum remains in contact with a wooden or metal object for 1 full round, it inflicts 25 points of acid damage (no save) to the object.

The acid DCs are Constitution-based. The acid damage is not doubled with a successful Vital Strike.

Sticky (Ex)

Bog scum is extremely sticky and difficult to get away from. The bog scum gains a +4 racial bonus on grapple checks.


Environment warm or temperate swamps
Organization solitary
Treasure none

A bog scum is a creeping layer of thick, green translucent ooze that lies atop the surface of rancid water or crawls along the ground toward prey. Though barely-intelligent, bog scum is highly effective at grabbing and digesting its prey. It can sense when living creatures get close and will spend hours crawling toward stationary, warm prey. Travelers report waking to a companion enveloped by bog scum, murdered by virtue of having slept closest to the water.

The bog scum attacks by forming itself up into a 12 ft. tall ball of green plasm and slamming part of its translucent body onto a nearby creature. The scum sticks to its prey and envelopes creatures, both suffocating and digesting its meal very slowly.

Section 15: Copyright Notice

Book of Beasts: Monsters of the River Nations, copyright 2010 Jon Brazer Enterprises; Author Steven Helt.

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