Abyssal Dragon Turtle

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Gargantuan Dragon (water), Neutral

Armor Class 20 (natural armor)

Hit Points 350 (30d12+150)

Speed 20 ft. swim 60 ft.

STR 26 (+8)

DEX 10 (+0)

CON 20 (+5)

INT 3 (-4)

WIS 12 (+1)

CHA 6 (-2)

Saving Throws Con +11, Wis +7

Skills Perception +6

Damage Resistances fire; cold

Condition Immunities grappled, paralyzed, poisoned

Senses darkvision 120 ft., passive Perception 16

Languages Aquan, Draconic

Challenge 21 (33,000 XP) Proficiency Bonus +6

Amphibious. The dragon turtle can breathe air and water.

Legendary Resistance (3/Day). If the dragon turtle fails a saving throw, it can choose to succeed instead.

Shell Shield. When the dragon turtle is in water, it can use its shell to gain a +2 bonus to AC.

Actions

Multiattack. The dragon turtle makes three attacks: one with its bite and two with its claws.

Bite. Melee weapon Attack: +12 to hit, reach 10 ft., one target. Hit: 30 (4d10+8) piercing damage.

Claw. Melee weapon Attack: +12 to hit, reach 10 ft., one target. Hit: 21 (3d8+8) slashing damage.

Abyssal Breath (Recharge 5-6). The dragon turtle exhales a 60-foot cone of saltwater and debris. Each creature in that area must make a DC 22 Strength saving throw, taking 72 (16d8) bludgeoning damage on a failed save, or half as much on a successful one.

Shell Smash. Melee weapon Attack: +12 to hit, reach 15 ft., all creatures in a 15-foot radius. Hit: 25 (5d6+8) bludgeoning damage. All creatures in a 15-foot radius must succeed on a DC 22 Strength saving throw or be knocked prone.

Legendary Actions

The Abyssal Dragon Turtle can take 3 legendary actions, choosing from the options below. Only one legendary action can be used at a time and only at the end of another creature's turn.

Detect. The dragon turtle makes a Wisdom (Perception) check.

Tail Attack. The dragon turtle makes a tail attack.

Dive (Costs 2 Actions). The dragon turtle dives underwater, becoming invisible until it resurfaces.

Lair

Regional Effects

The region containing the creature's lair is warped by its magic, creating the following effects:

Within 1 mile of the lair, the water becomes colder and murkier.
Creatures within the lair have disadvantage on attack rolls due to strong underwater currents.
Giant shellfish and other aquatic life are more abundant within 2 miles of the lair.

If the dragon turtle dies, these effects fade over the course of 1d10 days.

Environment Ocean, Coastal

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Lore & Description

Appearance

The Abyssal Dragon Turtle is a massive creature with deep emerald scales, its shell resembling jagged rocks and ocean floor debris. Its eyes glow a haunting blue, and barnacles cling to its thick, leathery skin, which exudes an aura of ancient power.

Behavior & Origins

Abyssal Dragon Turtles are ancient guardians of the ocean depths, often believed to be the reincarnations of sea gods. They are protective of their territories and are known to create violent whirlpools to dissuade unwanted visitors.

Generation Info

Original prompt:
"A dragon turtle of the deep ocean"

Created: Jan 28, 2026
Modified: May 31, 2026