Creature Reference Back to Creatures

Deep One

Medium · Humanoid · CR 2 · Chaotic Evil

Source. Tome of Beasts

13 (natural armor)

91 (14d8+28)

Ability Scores

Core attributes and their modifiers.

STR

DEX

CON

INT

WIS

-1

CHA

Overview

Category Monsters

Size Medium

Type Humanoid

Alignment Chaotic Evil

XP 450

Initiative Bonus +1

Movement

Walk 30 ft (9.1 m)

Swim 30 ft (9.1 m)

Climb 15 ft (4.6 m)

Crawl 15 ft (4.6 m)

Senses

Darkvision 120 ft (36.6 m)

Passive Perception 9

Saving Throws

Strength +5 Constitution +4 Charisma +3

Languages

Common, Void Speech

Resistances & Immunities

Damage Resistances

cold

Damage Vulnerabilities

fire

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.

Actions

Claws

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

About Deep One

Deep One is a medium humanoid with a Challenge Rating of 2. It has a chaotic evil alignment.

In combat, this creature maintains an Armor Class of 13 and possesses 91 hit points (derived from 14d8+28).

Deep One has communication capabilities including Common, Void Speech. This allows it to interact verbally with various creatures and characters.

GM Tips: Using Deep One

1 tips available

When using Deep One in your D&D 5e campaign, consider these tactical approaches:

Aquatic Combat: This creature can swim at 30 ft. It has advantage in water environments. Consider fighting on land or using water-based spells against it.

Player Guide: Facing Deep One

1 strategies available

When your party encounters this creature, keep these strategies in mind:

Aquatic Combat Defense: This creature can swim at 30 ft! It has advantage in water. Fight on land if possible. Use 'Control Water' or drain water sources to limit its mobility.

Encounter Building Calculator

Standard Party Encounter (4-5 characters):

This creature is a medium encounter for a party of 4 characters of level 2.

Solo Encounter:

A single character of level 4 (up to level 20) can face this creature in a medium to hard encounter.

Experience Point Thresholds:

Medium: 600 XP
Hard: 900 XP
Deadly: 1,200 XP

Based on D&D 5e Dungeon Master's Guide encounter building guidelines. CR roughly equals party level for medium encounters.

Frequently Asked Questions

What is the challenge rating of Deep One?: Deep One has a Challenge Rating of 2, making it appropriate for parties of level 2.0.
What type of creature is Deep One?: Deep One is a Medium Humanoid, which affects how certain spells and abilities interact with it.
What languages does Deep One speak?: Deep One can communicate in Common, Void Speech.