Deep One

Medium humanoid, chaotic evil

Armor Class 13 (natural armor)
Hit Points 91 (14d8 + 28)
Speed 30 ft., swim 30 ft.

16 (+3) 12 (+1) 14 (+2) 10 (+0) 8 (-1) 12 (+1)

Saving Throws Str +5, Con +4, Cha +3
Damage Vulnerabilities fire
Damage Resistances cold
Senses darkvision 120 ft., passive Perception 9
Languages Common, Void Speech
Challenge 2 (450 XP)

Special Traits

  • Amphibious. A deep one can breathe air or water with equal ease.
  • Frenzied Rage. On its next turn after a deep one takes 10 or more damage from a single attack, it has advantage on its claws attack and adds +2 to damage.
  • Lightless Depths. A deep one is immune to the pressure effects of the deep ocean.
  • Ocean Change. A deep one born to a human family resembles a human child, but transforms into an adult deep one between the ages of 16 and 30.


  • Claws. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 12 (2d8 + 3) slashing damage.


With enormous eyes, a wide mouth, and almost no chin, the deep ones are hideous, fish-like folk, often hunched and scaled when encountered in coastal villages.

Elder Gods. In their fully grown form, the deep ones are an ocean-dwelling race that worships elder gods and they dwell in deep water darkness. They’ve intermarried with coastal humans to create human-deep one hybrids.

Coastal Raiders. The deep ones keep to themselves in isolated coastal villages and settlements in the ocean for long periods, and then turn suddenly, at the command of their patron gods, into strong, relentless raiders, seizing territory, slaves, and wealth all along the coasts. Some deep ones have even founded small kingdoms lasting generations in backwater reaches or distant chilled seas.

Demand Sacrifices. They demand tolls from mariners frequently; those who do not leave tribute to them at certain islands or along certain straits find the fish escape their nets, or the storms shatter their hulls and drown their sailors. Over time, some seafaring nations have found it more profitable to ally themselves with the deep ones; this is the first step in their patient plans to dominate and rule. The deep ones are faithful servants of horrific powers inimical to all life on land.

Section 15: Copyright Notice

Tome of Beasts. Copyright 2016, Open Design; Authors Chris Harris, Dan Dillon, Rodrigo Garcia Carmona, and Wolfgang Baur.

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