Large Dragon, chaotic evil
Armor Class 18 (natural armor)
Hit Points 127 (15d10+45)
Speed fly +80, swim +40, walk +40
Challenge 7
Saving Throws cha +5, con +6, dex +5, wis +3
Skills stealth +5, perception +6
Damage Immunities acid
Senses blindsight 30 ft., darkvision 120 ft., passive Perception 16
Languages Common, Draconic
Amphibious. The dragon can breathe air and water.
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 4 (1d8) acid damage.
Claw. Melee Weapon Attack: +7 to hit, reach 5 ft., one target. Hit: 11 (2d6 + 4) slashing damage.
Acid Breath (Recharge 5-6). The dragon exhales acid in a 30-foot line that is 5 feet wide. Each creature in that line must make a DC 14 Dexterity saving throw, taking 49 (11d8) acid damage on a failed save, or half as much damage on a successful one.
Source: 5e Core Rules · OGL/Open