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System Reference Document 5.2.1
Actions
Multiattack. The dragon makes three Rend attacks.
Rend. Melee Attack Roll: +7 , reach 10 ft. Hit: 11 (2d6 
+ 4) Slashing damage plus 7 (2d6) Poison damage.
Poison Breath (Recharge 5–6). Constitution Saving 
Throw: DC 14, each creature in a 30-foot Cone. Failure: 
42 (12d6) Poison damage. Success: Half damage.
Adult Green Dragon
Huge Dragon (Chromatic), Lawful Evil
AC 19  Initiative +11 (21)
HP 207 (18d12 + 90)
Speed 40 ft., Fly 80 ft., Swim 40 ft.
MOD SAVE MOD SAVE MOD SAVE
Str 23 +6 +6 Dex 12 +1 +6 Con 21 +5 +5
Int 18 +4 +4 WIS 15 +2 +7 Cha 18 +4 +4
Skills Deception +9, Perception +12, Persuasion +9, 
Stealth +6
Immunities Poison; Poisoned
Senses Blindsight 60 ft., Darkvision 120 ft.; 
Passive Perception 22
Languages Common, Draconic
CR 15 (XP 13,000, or 15,000 in lair; PB +5)
Traits
Amphibious. The dragon can breathe air and water.
Legendary Resistance (3/Day, or 4/Day in Lair). If 
the dragon fails a saving throw, it can choose to suc-
ceed instead.
Actions
Multiattack. The dragon makes three Rend attacks. It 
can replace one attack with a use of Spellcasting to cast 
Mind Spike (level 3 version).
Rend. Melee Attack Roll: +11, reach 10 ft. Hit: 15 (2d8 
+ 6) Slashing damage plus 7 (2d6) Poison damage.
Poison Breath (Recharge 5–6). Constitution Saving 
Throw: DC 18, each creature in a 60-foot Cone. Fail-
ure: 56 (16d6) Poison damage. Success: Half damage.
Spellcasting. The dragon casts one of the following 
spells, requiring no Material components and using 
Charisma as the spellcasting ability (spell save DC 17):
At Will: Detect Magic, Mind Spike (level 3 version)
1/Day: Geas
Legendary Actions
Legendary Action Uses: 3 (4 in Lair). Immediately after 
another creature’s turn, the dragon can expend a use to 
take one of the following actions. The dragon regains all 
expended uses at the start of each of its turns.
Mind Invasion. The dragon uses Spellcasting to cast 
Mind Spike (level 3 version).
Noxious Miasma. Constitution Saving Throw: DC 17 , 
each creature in a 20-foot-radius Sphere centered on a 
point the dragon can see within 90 feet. Failure: 7 (2d6) 
Poison damage, and the target takes a −2 penalty to AC 
until the end of its next turn. Failure or Success: The 
dragon can’t take this action again until the start of its 
next turn.
Pounce. The dragon moves up to half its Speed, and it 
makes one Rend attack.
Ancient Green Dragon
Gargantuan Dragon (Chromatic), Lawful Evil
AC 21  Initiative +15 (25)
HP 402 (23d20 + 161)
Speed 40 ft., Fly 80 ft., Swim 40 ft.
MOD SAVE MOD SAVE MOD SAVE
Str 27 +8 +8 Dex 12 +1 +8 Con 25 +7 +7
Int 20 +5 +5 WIS 17 +3 +10 Cha 22 +6 +6
Skills Deception +13, Perception +17 , Persuasion +13, 
Stealth +8
Immunities Poison; Poisoned
Senses Blindsight 60 ft., Darkvision 120 ft.; 
Passive Perception 27
Languages Common, Draconic
CR 22 (XP 41,000, or 50,000 in lair; PB +7)
Traits
Amphibious. The dragon can breathe air and water.
Legendary Resistance (4/Day, or 5/Day in Lair). If 
the dragon fails a saving throw, it can choose to suc-
ceed instead.
Actions
Multiattack. The dragon makes three Rend attacks. It 
can replace one attack with a use of Spellcasting to cast 
Mind Spike (level 5 version).
Rend. Melee Attack Roll: +15, reach 15 ft. Hit: 17 (2d8 
+ 8) Slashing damage plus 10 (3d6) Poison damage.
Poison Breath (Recharge 5–6). Constitution Saving 
Throw: DC 22, each creature in a 90-foot Cone. Fail-
ure: 77 (22d6) Poison damage. Success: Half damage.
Spellcasting. The dragon casts one of the following 
spells, requiring no Material components and using 
Charisma as the spellcasting ability (spell save DC 21):
At Will: Detect Magic, Mind Spike (level 5 version)
1/Day Each: Geas, Modify Memory