Ancient Green Dragon — fantasy monster illustration. Ancient Green Dragon is a gargantuan dragon (Challenge Rating 22).

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Ancient Green Dragon

Gargantuan Dragon, lawful evil

AC
21
HP
385
Speed
40
CR
22

Armor Class 21 (natural armor)

Hit Points 385 (22d20+154)

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


STR
27 (+8)
DEX
12 (+1)
CON
25 (+7)
INT
20 (+5)
WIS
17 (+3)
CHA
19 (+4)

Saving Throws Cha +11, Con +14, Dex +8, Wis +10

Skills Insight +10, Stealth +8, Deception +11, Perception +17, Persuasion +11

Damage Immunities poison

Condition Immunities poisoned

Senses blindsight 60 ft., darkvision 120 ft., passive Perception 27

Languages Common, Draconic

Challenge 22


Traits

Amphibious. The dragon can breathe air and water.

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

Actions

Multiattack. The dragon can use its Frightful Presence. It then makes three attacks: one with its bite and two with its claws.

Bite. Melee Weapon Attack: +15 to hit, reach 15 ft., one target. Hit: 19 (2d10 + 8) piercing damage plus 10 (3d6) poison damage.

Claw. Melee Weapon Attack: +15 to hit, reach 10 ft., one target. Hit: 22 (4d6 + 8) slashing damage.

Tail. Melee Weapon Attack: +15 to hit, reach 20 ft., one target. Hit: 17 (2d8 + 8) bludgeoning damage.

Frightful Presence. Each creature of the dragon's choice that is within 120 feet of the dragon and aware of it must succeed on a DC 19 Wisdom saving throw or become frightened for 1 minute. A creature can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success. If a creature's saving throw is successful or the effect ends for it, the creature is immune to the dragon's Frightful Presence for the next 24 hours.

Poison Breath (Recharge 5-6). The dragon exhales poisonous gas in a 90-foot cone. Each creature in that area must make a DC 22 Constitution saving throw, taking 77 (22d6) poison damage on a failed save, or half as much damage on a successful one.

Legendary Actions

The dragon can take 3 legendary actions, choosing from the options below. Only one legendary action option can be used at a time and only at the end of another creature's turn. The dragon regains spent legendary actions at the start of its turn.

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

Tail Attack. The dragon makes a tail attack.

Wing Attack (Costs 2 Actions). The dragon beats its wings. Each creature within 15 ft. of the dragon must succeed on a DC 23 Dexterity saving throw or take 15 (2d6 + 8) bludgeoning damage and be knocked prone. The dragon can then fly up to half its flying speed.

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Ancient Green Dragon — fantasy monster illustrationPrimary
FTTHelper · auto-generated · monster · monster

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Further reading

Jetpack7 Game Master Series
The Game Master's Book of Legendary Dragons
Aaron Hübrich · 2022
The Game Master's Book of Random Encounters
Jeff Ashworth · 2020
The Game Master's Book of Traps, Puzzles and Dungeons
Jeff Ashworth · 2022