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Giant, Sea

Large giant, chaotic neutral

Armor Class 17 (natural armor)
Hit Points 178 (17d10 + 85)
Speed 40 ft., swim 30 ft.

29 (+9) 14 (+2) 20 (+5) 17 (+3) 18 (+4) 19 (+4)

Saving Throws Constitution +9
Skills Acrobatics +6, Athletics +13, Intimidation +8, Perception +8, Stealth +6
Senses darkvision 120 ft., passive Perception 18
Languages Aquan, Common, Giant
Challenge 9 (5,000 XP)

Special Traits


  • Multiattack. The sea giant makes two slam attacks.
  • Slam. Melee Weapon Attack: +13 to hit, reach 10 ft., one target. Hit: 18 (2d8 + 9) bludgeoning damage.
  • Rock. Ranged Weapon Attack: +13 to hit, range 60/240 ft., one target. Hit: 27 (4d8 + 9) bludgeoning damage.
  • Crushing Pressure (Recharge 5-6). The sea giant chooses an area of water no larger than a 50-foot cube with 30 ft. of it. The water pressure within the space magically increases, and creatures within the area treat it as difficult terrain. In addition, any creature who enters or begins its turn within the area must make a DC 18 Constitution saving throw, taking 18 (4d8) bludgeoning damage on a failed saving throw, or half as much damage on a successful one. The area remains affected by this magic for 1 minute, until the sea giant dismisses it as an action, or the sea giant dies.


This huge being has bluish green skin and eyes that reflect light like two silvery moons. Rippling with muscle, this creature rises from the depths with a crash of waves on rocks.

Sea giants are the reclusive cousins of storm giants. They are most often found in the deepest depths of the seas where they make their dwelling in the cones of long-dead undersea volcanoes.

Sea giants have a druid-like power over the forces of the seas and are a living embodiment of its bounty and destructive wrath.

Sea giants seldom come into contact with surface-dwellers but have been known on rare occasions to exact bounties from coastal cities to ensure the safety of their navies and merchant vessels. Sea giants are most commonly encountered within a few hundred miles of their lair, tending to their domain and battling off incursions of sahuagin, aboleth, krakens and other such destructive forces of the undersea.

An adult male sea giant stands 10 feet tall and weighs about 6,000 pounds. Females are slightly shorter and lighter. Both have sea-green skin, dark-green or black hair, and silver eyes. Sea giants adorn themselves in loose flowing robes of white, blue, or green. Many wear wreaths of coral in their hair.

When battling at the surface of the seas, sea giants hurl rocks at great length against opposing ranged attackers, usually including crews of siege engines. When battling against surface ships their tactic is to disguise themselves by creating rough waters with their control water ability. They then hammer the hull with their mighty fists until it is holed, without ever revealing themselves to the crew. Once holed, they tear the hull apart and drown the crew.

When fighting beneath the waves they use their crushing pressure special ability to increase the water pressure around themselves in an effort to destroy interlopers and trespassers.

Section 15: Copyright Notice
Tome of Horrors © 2018, Frog God Games, LLC; Authors: Kevin Baase, Erica Balsley, John “Pexx” Barnhouse, Christopher Bishop, Casey Christofferson, Jim Collura, Andrea Costantini, Jayson ‘Rocky' Gardner, Zach Glazar, Meghan Greene, Scott Greene, Lance Hawvermale, Travis Hawvermale, Ian S. Johnston, Bill Kenower, Patrick Lawinger, Rhiannon Louve, Ian McGarty, Edwin Nagy, James Patterson, Nathan Paul, Patrick N. Pilgrim, Clark Peterson, Anthony Pryor, Greg Ragland, Robert Schwalb, G. Scott Swift, Greg A. Vaughan, and Bill Webb