Sarcophagus Clam

Large beast, unaligned

Armor Class 16 (natural)
Hit Points 60 (8d10+16)
Speed 0 ft.

24 (+7) 1 (-5) 14 (+2) 1 (-5) 10 (+0) 4 (-3)

Damage Resistances acid, fire, piercing, slashing
Condition Immunities charmed, exhaustion, frightened, prone
Senses blindsight 30 ft., passive Perception 10
Challenge 4 (1,100 XP)


  • Camouflage. A sarcophagus clam appears as a normal, if large, specimen of clam. A DC 15 Wisdom (Survival) or Intelligence (Nature) check reveals that the sarcophagus clam is both unusual and dangerous.
  • Water Breathing. The sarcophagus clam can breathe only underwater.


  • Tentacles. Melee Weapon Attack: +15 to hit, reach 10 ft., one target. Hit: 11 (1d6+7) bludgeoning damage. If the target is a creature, it is grappled (escape DC 14) and must succeed on a DC 14 Strength saving throw or be pulled 10 ft. toward the clam. Until this grapple ends, the target is restrained. The sarcophagus clam may only have one creature grappled at a time.
  • Swallow Whole. As an action, the sarcophagus clam may swallow one grappled creature of size Medium or smaller whole. The swallowed target is blinded and restrained, it has total cover against attacks and other effects outside the clam, and it takes 11 (3d6) acid damage at the start of each of the clam’s turns. The clam can have only one creature swallowed at a time and may not make a tentacle attack while it has a creature swallowed. If the behemoth takes 20 points of damage or more from the swallowed creature in a single turn, it must succeed on a DC 20 Constitution save or regurgitate the swallowed creature, which fall prone in a space within 10 feet of the clam. If the clam dies, a swallowed creature is no longer restrained by it and can escape from the corpse using 10 feet of movement and exiting prone. Once its victim is inside, the clam snaps shut and begins to flood its interior with acid, while the foot drags the victim over the razor sharp protrusions of its inner shell. The average sarcophagus clam can hold a Medium creature, although much larger specimens are known to exist.


This shellfish is roughly the shape of a coffin and is the size of a small wagon.

A sarcophagus clam is a deadly hazard to creatures that travel the sea floor. They appear to be unremarkable giant clams until prey passes within reach. Their foot has evolved into a powerful tentacle that grapples targets and pulls them into its thick shell.

Sarcophagus clams are normally found singularly, often in shallow water and natural harbors, though merfolk legends tell of great beds of hundreds of sarcophagus clams that are capable of swallowing entire armies within seconds.

Frequently, indigestible materials are found within the clam’s shell after it is slain, and rarely, high quality pearls are within the clam as well. Some races fashion plate armor and heavy shields out of unbroken sarcophagus clam shells.

Section 15: Copyright Notice

5e Menagerie: Trash Gryphon © 2019, Rogue Genius Games; Author: Jacob E. Blackmon.

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