Young Green Dragon

Large dragon, lawful evil
Armor Class 18 (natural armor)
Hit Points 136 (16d10 + 48)
Speed 40 ft., fly 80 ft., swim 40 ft.
STR
19 (+4)
DEX
12 (+1)
CON
17 (+3)
INT
16 (+3)
WIS
13 (+1)
CHA
15 (+2)
Saving Throws Dex +4, Con +6, Wis +4, Cha +5
Skills Deception +5, Perception +7, Stealth +4
Damage Immunities poison
Condition Immunities poisoned
Senses blindsight 30 ft., darkvision 120 ft., passive Perception 17
Languages Common, Draconic
Challenge 8 (3900 XP)

Amphibious. The dragon can breathe air and water.

ACTIONS

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

Bite. Melee Weapon Attack: +7 to hit, reach 10 ft., one target. Hit: 15 (2d10 + 4) piercing damage plus 7 (2d6) poison damage.

Claw. Melee Weapon Attack: +7 to hit, reach 5 ft., one target. Hit: 11 (2d6 + 4) slashing damage.

Poison Breath (Recharge 5-6). The dragon exhales poisonous gas in a 30-foot cone. Each creature in that area must make a DC 14 Constitution saving throw, taking 42 (12d6) poison damage on a failed save, or half as much damage on a successful one.

The most cunning and treacherous of true dragons, green dragons use misdirection and trickery to get the upper hand against their enemies. A green dragon is recognized by the crest that begins near its eyes and continues down its spine, reaching full height just behind the skull.
Monster Manual (SRD) D&D 5 › Monsters