Huge beast, unaligned

Armor Class 19 (carapace)
Hit Points 333 (29d12 + 145)
Speed 30 ft., swim 40 ft.

21 (+5) 18 (+4) 20 (+5) 4 (-3) 13 (+1) 16 (+3)

Saving Throws Con +11, Str +11
Skills Perception +13
Damage Resistance(s) thunder
Senses blindsight 60 ft., darkvision 60 ft., passive Perception 23
Challenge 18 (20,000 XP)


  • Clawed Terror. All creatures that take thunder damage from the reefhammer’s pincer attack must attempt a DC 19 Constitution saving throw or be stunned for 1 round. They must then attempt a DC 19 Constitution saving throw or be blinded until the start of the reefhammer’s next turn. A successful saving throw renders a creature immune to the corresponding condition from the reefhammer’s pincer attacks until the beginning of a reefhammer’s next turn.
  • Shattering Strike. A reefhammer deals double damage to objects, and gains advantage on attacks rolls against armored targets.
  • Uncanny Eyesight. A reefhammer gains double its normal proficiency bonus on Perception checks, and it has advantage on saving throws against illusions. A reefhammer can see hidden or invisible creatures within 30 feet.


  • Multiattack. A reefhammer makes 3 pincer attacks.
  • Pincer. Melee Weapon Attack: +11 to hit, reach 15 ft., Hit: 20 (4d6 + 6) bludgeoning damage. All creatures within 20 ft. of a pincer attack take 10 (3d6) thunder damage.


A reefhammer can take 2 legendary actions, choosing from the options below. Only one legendary action option can be used at a time and only at the end of another creature’s turn. A reefhammer regains spent legendary actions at the start of its turn.

  • Move. The reefhammer moves up to half its speed.
  • Reflexive Snap. The reefhammer makes a pincer attack against one foe within reach.


Ferocious hunters, reefhammers terrorize both coastal waters and major rivers, feeding voraciously on fish, crustaceans, dolphins, and even land mammals come to riverbanks to drink. Once a reefhammer latches onto a victim it stays attached until either it or its prey is dead.

Reefhammers are vicious predators. They possess greater intelligence than animals, but rely mainly on their strength and instincts to survive. They hunt fish, giant crabs, dolphins, and even land-dwelling creatures that come within a hundred paces of the water.

In populated areas, reefhammers prey on beachcombers, divers, and fishermen, sometimes abandoning their usual solitary nature and coordinating attacks with other reefhammers. The creatures must be wary, however, because in some regions, these abominations find their way to the dinner plate. Brave fishermen troll bays and coastlines infested with reefhammers, baiting the creatures with fresh meat and then harvesting their powerful claws with axes.

Reefhammers cannot speak, but the creatures understand the languages used by humanoids near their hunting grounds. They use this knowledge in order to avoid fishermen and coordinate attacks. Reefhammers keep no treasure, instead savoring the taste of flesh and crunch of bone and shell as much as a miser covets his gold.

A typical reefhammer reaches approximately 3-1/2 feet long at adulthood and weighs 70 pounds. Females gather to breed once every 2 to 3 years, engaging in a predatory hunt for a male and leaving him shredded to pieces.

Section 15: Copyright Notice

Latin American Monsters (5E) © 2021, Legendary Games; Authors Miguel Colon, Ismael Alvarez, Robert J. Grady, Jason Nelson.

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