Deep One

Medium Humanoid, chaotic evil

Armor Class 13 (natural armor)

Hit Points 91 (14d8+28)

Speed swim +30, walk +30

Challenge 2

STR
16
+3
DEX
12
+1
CON
14
+2
INT
10
+0
WIS
8
-1
CHA
12
+1

Saving Throws cha +3, con +4, str +5

Damage Vulnerabilities fire

Damage Resistances cold

Senses darkvision 120 ft., passive Perception 9

Languages Common, Void Speech

Special Abilities

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.

Source: Tome of Beasts · OGL/Open