You are viewing the legacy Pathfinder Reference Document website.
Paizo Inc. has now partnered with Archives of Nethys to provide the online version of the Pathfinder RPG rules at
Learn more.

Pathfinder Reference Document
Pathfinder Reference Document

Crab, Giant

This lumbering hard-shelled crab stands as tall as a dwarf, its massive pincers waving menacingly.

Giant Crab CR 2

XP 600

N Medium vermin (aquatic)

Init +1; Senses darkvision 60 ft.; Perception +4


AC 16, touch 11, flat-footed 15 (+1 Dex, +5 natural)

hp 19 (3d8+6)

Fort +5, Ref +2, Will +1

Immune mind-affecting effects


Speed 30 ft., swim 20 ft.

Melee 2 claws +4 (1d4+2 plus grab)

Special Attacks constrict (1d4+2)


Str 15, Dex 13, Con 14, Int —, Wis 10, Cha 2

Base Atk +2; CMB +4 (+8 grapple); CMD 15 (27 vs. trip)

Skills Perception +4, Swim +10; Racial Modifiers +4 Perception

SQ water dependency


Environment any aquatic

Organization solitary or cast (2–12)

Treasure none

Special Abilities

Water Dependency (Ex) Giant crabs can survive out of the water for 1 hour per point of Constitution. Beyond this limit, a giant crab runs the risk of suffocation, as if it were drowning.

Giant crabs behave much like their smaller cousins, feeding on both plant material like algae and fungus and animal matter such as fish, seabirds, and even unwary humanoids. The coloration of a giant crab's hard exoskeleton varies widely depending on species, and over time even shifts in response to its diet.

Other species of giant crab exist as well, some smaller but most quite a bit larger. You can adjust the stats given here by changing Hit Dice and size (changing Strength, Dexterity, and Constitution as appropriate) to represent a wide range of different species of giant crab. The following table lists the most common variants.

King crab1/4Tiny1d8
Coconut crab1/2Small1d8
Rock crab4Large5d8
Shark-eating crab7Huge8d8
Great reef crab10Gargantuan11d8
Shipwrecker crab13Colossal14d8

Crab Swarm

A writhing mass of clacking shells and snapping pincers rushes from the surf, their spider-like legs twitching across the sand.

Crab Swarm CR 4

XP 1,200

N Diminutive vermin (aquatic, swarm)

Init +2; Senses darkvision 60 ft.; Perception +0


AC 18, touch 16, flat-footed 16 (+2 Dex, +2 natural, +4 size)

hp 38 (7d8+7)

Fort +6, Ref +4, Will +2

Immune mind-affecting effects, swarm traits, weapon damage


Speed 30 ft., swim 20 ft.

Melee swarm (2d6)

Space 10 ft.; Reach 0 ft.

Special Attacks distraction (DC 14)


Str 1, Dex 14, Con 13, Int —, Wis 10, Cha 2

Base Atk +5; CMB —; CMD

Skills Swim +10; Racial Modifiers uses Dex to modify Swim


Environment any aquatic

Organization solitary, pair, or wave (3–8 swarms)

Treasure none

Crab swarms contain over a thousand normal-sized crabs that rush over their victims, plucking flesh with thousands of pinching claws. Some fishermen claim tides and phases of the moon cause these creatures to swarm as they do.