Archives of Nethys

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Undigested Swarm

This brown-and-yellow sludge appears to be made of multiple smaller globules churning in a disgusting communal mass.

Undigested Swarm CR 5

Source Bestiary 5 pg. 258
XP 1,600
NE Tiny undead (swarm)
Init +3; Senses darkvision 60 ft.; Perception +8


AC 17, touch 16, flat-footed 13 (+3 Dex, +1 dodge, +1 natural, +2 size)
hp 54 (12d8)
Fort +4, Ref +9, Will +9
Defensive Abilities amorphous, swarm traits; Immune undead traits; Resist acid 10


Speed 30 ft., climb 20 ft., swim 20 ft.
Melee swarm (3d6 plus digest and distraction)
Space 10 ft., Reach 0 ft.
Special Attacks digest, distraction (DC 16)


Str 4, Dex 16, Con —, Int 3, Wis 9, Cha 11
Base Atk +9; CMB —; CMD
Feats Dodge, Improved Iron Will, Iron Will, Lightning Reflexes, Mobility, Skill Focus (Perception)
Skills Climb +14, Perception +8, Stealth +17, Swim +14
Languages Common (can’t speak)


Environment any
Organization solitary, pack (2–5), or infestation (6–12)
Treasure none

Special Abilities

Digest (Ex) A target that takes swarm damage from an undigested swarm is covered in acidic slime and must succeed at a DC 16 Reflex save or take 2d6 points of acid damage for 1d4 rounds at the start of its turn. An affected creature can make a new save as a full-round action. Washing off the acid grants a +4 bonus on this save. The save DC is Constitution-based.


Whereas individual undigested are more of a nuisance than a threat to adventurers, a swarm of such creatures can be dangerous to even experienced adventurers. An undigested swarm comprises hundreds of individual undigested. Driven by insatiable hunger, they fall upon and consume any living creatures crossing their path, surrounding the unfortunate victims and drenching them in acidic slime, digesting their still-living prey even before the screaming ends.