Shrimp, Giant Mantis

Family: Aquatic & Fish

Huge beast, unaligned

Armor Class 19 (natural armor)
Hit Points 276 (24d12+120)
Speed 30 ft., swim 40 ft. ft.

24 (+7) 18 (+4) 20 (+5) 4 (-3) 13 (+1) 16 (+3)

Damage Resistance(s) thunder; Senses blindsight 60 ft., darkvision 60 ft., passive Perception 11
Challenge 18 (20,000 XP)

Special Traits

  • Shattering Strike. A reefhammer deals double damage to objects, and gains advantage on attacks rolls against armored targets.


  • Multiattack. A reefhammer makes 3 pincer attacks.
  • Pincer. Melee Weapon Attack: +13 to hit, 15 ft. reach. Hit: 25 (4d8 + 7) bludgeoning damage. All creatures within 20 ft. of a pincer attack take 10 (3d6) thunder damage and must make a DC 18 Constitution saving throw or be stunned for one round. They must then make another DC 18 Constitution saving throw or be blinded for 1 round. A successful save renders a creature immune to the corresponding condition from this attack until the beginning of Reefhammer’s next turn.

Legendary Actions

The greatest of giant mantis shrimps are called “Reefhammers” and are considered legendary creatures. 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.

  • Reflexive Snap (Costs 1 action). Reefhammer makes a pincer attack against one foe within reach.


Though the colorful shells of giant mantis shrimp are beautiful to behold, the sight of one often means death. These apex predators prowl tide pools and coastal shallows, competing for territory with karkinoi and shark eater crabs. A typical giant mantis shrimp grows to 4 feet high and 6 feet long and weighs around 200 pounds.

Section 15: Copyright Notice

Pirate Campaign Compendium © 2018, Legendary Games; Lead Designer Jason Nelson. Authors: Alex Augunas, Jeff Gomez, Matt Goodall, Jim Groves, Tim Hitchcock, Victoria Jaczko, Jonathan H. Keith, Lyz Liddell, Thomas J. Phillips, Alistair J. Rigg, Alex Riggs, Loren Sieg, Neil Spicer, Todd Stewart, Rachel Ventura, Michael D. Welham, Linda Zayas-Palmer.

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