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Hermit Crab Swarm

Hermit Crab Swarm Creature4

N Large Amphibious Animal Swarm

Senses Perception +11; darkvision, tremorsense (imprecise) 15 feet

Skills Athletics +12

Str +4, Dex +2, Con +3, Int -4, Wis +1, Cha -1

AC 19; Fort +13, Ref +10, Will +7

HP 42; Immunities precision, swarm mind; Weaknesses area damage 5, splash damage 5; Resistances piercing 5, slashing 5

Speed 30 feet, swim 15 feet

Swarming Snips [one-action] Each enemy in the swarm’s space takes 2d8 piercing damage (DC 20 basic Reflex save). Creatures that fail this save also take 1d4 persistent bleed damage.


Hermit crabs have hard exoskeletons like other crabs, but with much weaker abdomens. They find and “wear” shells as homes and protection, getting around with their front legs and claws. Surprisingly fierce, hermit crabs fight for new shells as they grow bigger, using an assortment of hollow alternatives as substitutes when shells of the right size can’t be found.

When hermit crabs find a shell that is too large, they lie in wait for others to arrive and move into the shell, abandoning a possible replacement. This can form a large chain of queuing crabs waiting to upgrade their shells. Interruptions can aggravate the crabs, resulting in attacks against the unfortunate source of disruption.

Hermit crabs often form symbiotic relationships with sea anemones, attaching them to their shells. The anemones help protect the crabs while feasting on leftovers from the crabs’ meals. When hermit crabs change shells, they often take their anemone partners with them to continue their lifelong adventure.

Section 15: Copyright Notice

Pathfinder Bestiary 3 (Second Edition) © 2021, Paizo Inc.; Authors: Logan Bonner, James Case, Jessica Catalan, John Compton, Paris Crenshaw, Adam Daigle, Katina Davis, Erik Scott de Bie, Jesse Decker, Brian Duckwitz, Hexe Fey, Keith Garrett, Matthew Goodall, Violet Gray, Alice Grizzle, Steven Hammond, Sasha Laranoa Harving, Joan Hong, James Jacobs, Michelle Jones, Virginia Jordan, Tj Kahn, Mikko Kallio, Jason Keeley, Joshua Kim, Avi Kool, Jeff Lee, Lyz Liddell, Luis Loza, Ron Lundeen, Philippe-Antoine Menard, Patchen Mortimer, Dennis Muldoon, Andrew Mullen, Quinn Murphy, Dave Nelson, Jason Nelson, Samantha Phelan, Stephen Radney-Macfarland, Danita Rambo, Shiv Ramdas, Bj Recio, Jessica Redekop, Mikhail Rekun, Patrick Renie, Alex Riggs, David N. Ross, Simone D. Sallé, Michael Sayre, Mark Seifter, Sen.H.H.S, Abigail Slater, Rodney Sloan, Shay Snow, Pidj Sorensen, Kendra Leigh Speedling, Tan Shao Han, William Thompson, Jason Tondro, Clark Valentine, Ruvaid Virk, Skylar Wall, Andrew White, and Landon Winkler.