Adult Deep Dragon

Huge Dragon, Neutral Evil

Armor Class 17 (natural armor)

Hit Points 147 (14d12 + 56)

Speed 40 ft., fly 80 ft., swim 40 ft., burrow 30 ft.

STR

DEX

CON

INT

WIS

CHA

Saving Throws DEX +6, CON +8, WIS +7, CHA +8

Skills Perception +7, Persuasion +12, Stealth +10

Damage Resistances poison, psychic

Condition Immunities Charmed, Frightened, Poisoned

Senses blindsight 60 ft., darkvision 150 ft., passive Perception 17

Languages Common, Draconic, Undercommon

Challenge 11 (7,200 XP)

Traits

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

Actions

Multiattack. The dragon makes one Bite attack and two Claw attacks.

Bite. Melee Weapon Attack: +9 to hit, reach 10 ft., one target. Hit:16 (2d10 + 5) piercing damage plus 5 (1d10) poison damage.

Claw. Melee Weapon Attack: +9 to hit, reach 5 ft., one target. Hit:8 (1d6 + 5) slashing damage.

Tail. Melee Weapon Attack: +9 to hit, reach 15 ft., one target. Hit:9 (1d8 + 5) bludgeoning damage. If the target is a creature, it must succeed on a DC 17 Strength saving throw or be knocked prone.

Change Shape. The dragon magically transforms into any creature that is Medium or Small, while retaining its game statistics (other than its size). This transformation ends if the dragon is reduced to 0 hit points or uses its action to end it.

Nightmare Breath (Recharge 5–6). The dragon exhales a cloud of spores in a 60-foot cone. Each creature in that area must make a DC 16 Wisdom saving throw. On a failed save, the creature takes 33 (6d10) psychic damage, and it is frightened of the dragon for 1 minute. On a successful save, the creature takes half as much damage with no additional effects. A frightened creature can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success.

Legendary Actions

Commanding Spores. The dragon releases spores around a creature within 30 feet of it that it can see. The target must succeed on a DC 16 Wisdom saving throw or use its reaction to make a melee weapon attack against a random creature within reach. If no creatures are within reach, or the target can't take a reaction, it takes 5 (1d10) psychic damage.

Tail. The dragon makes one Tail attack.

Spore Salvo (Costs 2 Actions). The dragon releases poisonous spores around a creature within 30 feet of it that it can see. The target must succeed on a DC 16 Constitution saving throw or take 17 (5d6) poison damage and become poisoned for 1 minute. The poisoned creature can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success.

Lore

Making their lairs in the depths of the Underdark, deep dragons are nightmarish cousins of chromatic dragons. The warped magical energy of their subterranean realm gives them the ability to exhale magical spores that instill fear and scar the mind.