This long, insectile creature has massive mandibles and dozens of segmented legs extend from its sides.
Giant Hellgrammite CR 5
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
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
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.
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.