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Aquatic Insect, Hellgrammite

This long, insectile creature has massive mandibles and dozens of segmented legs extend from its sides.

Giant Hellgrammite CR 5

XP 1,600
N Large vermin (aquatic)
Init +2; Senses darkvision 60 ft.; Perception +3


AC 18, touch 11, flat-footed 16 (+2 Dex, +7 natural, –1 size)
hp 52 (7d8+21)
Fort +8, Ref +4, Will +1
Immune mind-affecting effects


Speed 30 ft., swim 20 ft.
Melee bite +8 (2d6+4 plus grab), tail slap +3 (1d8+2)
Space 10 ft.; Reach 5 ft.
Special Attacks death grip, constrict (2d6+4)


Str 19, Dex 15, Con 16, Int —, Wis 9, Cha 2
Base Atk +5; CMB +10 (+14 grapple); CMD 22 (can’t be tripped)
Skills Perception +3 (+7 in water), Stealth –2 (+6 in water), Swim +12; Racial Modifiers +4 Perception (+8 in water), +8 Stealth in water
SQ amphibious


Death Grip (Ex)

A creature that is grappled by a giant hellgrammite continues to be grappled when the giant hellgrammite is killed and takes 1d6+4 points of damage each round at the start of its turn unless it succeeds at a DC 22 Escape Artist check or a DC 20 Strength check, or until the hellgrammite’s corpse takes an additional 10 points of damage.


Environment temperate rivers
Organization solitary or pair
Treasure incidental

While these giant insects have a reputation for being highly ferocious predators, they are actually just the larval form of large but mostly harmless dragonfly-like insects.

Section 15: Copyright Notice

Pathfinder Roleplaying Game Bestiary 6 © 2017, Paizo Inc.; Authors: Robert Brookes, Benjamin Bruck, John Compton, Paris Crenshaw, Adam Daigle, Crystal Frasier, James Jacobs, Thurston Hillman, Tim Hitchcock, Brandon Hodge, Jason Keeley, Isabelle Lee, Jason Nelson, Tim Nightengale, F. Wesley Schneider, David Schwartz, Mark Seifter, Todd Stewart, Josh Vogt, and Linda Zayas-Palmer.