Huge Dragon
Armor Class 16
Hit Points 55 (10d8+10)
Speed fly +60, swim +30, walk +30
Challenge 3
Skills stealth +4, perception +2
Damage Immunities poison
Condition Immunities poisoned
Senses blindsight 10 ft., darkvision 60 ft., passive Perception 12
Languages Draconic
Amphibious. The dragon can breathe air and water.
Woodland Stalker. When in a forested area, the dragon has advantage on Stealth checks.
Bite. Melee Weapon Attack: +4 to hit, reach 5 ft., one target. Hit: 13 (2d10 + 2) piercing damage.
Poison Breath (Recharge 5-6). The dragon exhales poisonous gas in a 15-foot cone. Each creature in that area makes a DC 11 Constitution saving throw taking 14 (4d6) poison damage on a failed save or half damage on a success.
Source: Level Up Advanced 5e Monstrous Menagerie · OGL/Open