Crab, Sporous

Small beast, unaligned

Armor Class 14 (natural armor)
Hit Points 33 (6d6 + 12)
Speed 30 ft., swim 30 ft.

14 (+2) 8 (?1) 15 (+2) 3 (?4) 13 (+1) 4 (?3)

Damage Vulnerabilities fire
Damage Resistances bludgeoning
Damage Immunities poison
Condition Immunities poisoned
Senses darkvision 60 ft., passive Perception 11
Challenge 1 (200 XP)


  • Amphibious. The sporous crab can breathe air and water.
  • Filthy. The sporous crab makes its home in grime and muck and is covered in filth. A creature that touches the sporous crab or hits it with a melee attack while within 5 feet of it must succeed on a DC 12 Constitution saving throw or be poisoned until the end of its next turn. If a creature fails the saving throw by 5 or more, it also contracts sewer plague. On a successful saving throw, the creature is immune to the crab’s Filthy trait for the next 24 hours.


  • Multiattack. The sporous crab makes two claw attacks.
  • Claw. Melee Weapon Attack: +4 to hit, reach 5 ft., one creature. Hit: 4 (1d4 + 2) bludgeoning damage.
  • Spore (Recharge 6). The sporous crab sprays spores in a 15-foot cone. Each creature in the area must make a DC 12 Constitution saving throw. On a failure, a creature takes 7 (2d6) poison damage and becomes infected with the crab’s spores. On a success, a creature takes half the damage and isn’t infected with spores. After 1 hour, small bubbles and bumps appear across the skin of the infected creature. At the end of each long rest, the infected creature must make a DC 12 Constitution saving throw. On a success, the infected creature’s body fights off the spores and no longer has to make the saving throw. If a creature fails the saving throw every day for 7 days, young sporous crabs hatch from the creature’s skin, and the creature takes 9 (2d8) slashing damage. The spores can also be removed with a lesser restoration spell or similar magic.


Most sporous crabs spend a considerable amount of their lives in sewers and brackish ponds. The filth clings to them throughout their lives, and they are toxic to almost every creature they encounter. The sporous crab is usually found near the brachyura shambler (see page 49). Both creatures are perfectly at home in filth, and they are likely related.

The shamblers have far superior intelligence and thus have something resembling a cohesive society. By comparison, the sporous crabs are more akin to pets, guardians, or parasites.

They support and protect the shamblers and may offer some form of companionship, but they are not equal members in the shambler society.

The adhesive material produced by a resinous frog remains viable for 24 hours after it is removed from the frog. A resinous frog produces one ounce of collectible resin each day or four ounces if slain. One ounce of resin can cover a 1-foot square surface and creates a bond between any two objects. A successful DC 13 Strength check breaks the bond, freeing the objects from each other.

Section 15: Copyright Notice

Tome of Beasts 2. © 2020 Open Design LLC; Authors Wolfgang Baur, Celeste Conowitch, Darrin Drader, James Introcaso, Philip Larwood, Jeff Lee, Kelly Pawlik, Brian Suskind, Mike Welham.

This is not the complete section 15 entry - see the full license for this page