Large dragon, lawful good

• Armor Class 18 (natural armor)
• Hit Points 142 (15d10 + 60)
• Speed 40 ft., fly 80 ft., swim 40 ft.

• Skills Insight +4, Perception +7, Stealth +3
• Damage Immunities lightning
• Senses blindsight 30 ft., darkvision 120 ft., passive Perception 17
• Languages Common, Draconic
• Challenge 8 (3,900 XP)

Traits

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: +8 to hit, reach 10 ft., one target. Hit: 16 (2d10 + 5) piercing damage.

Claw. Melee Weapon Attack: +8 to hit, reach 5 ft., one target. Hit: 12 (2d6 + 5) slashing damage.

Breath Weapons (Recharge 5-6). The dragon uses one of the following breath weapons.

• Lightning Breath. The dragon exhales lightning in a 60 foot line that is 5 feet wide. Each creature in that line must make a DC 15 Dexterity saving throw, taking 55 (10d10) lightning damage on a failed save, or half as much damage on a successful one.
• Repulsion Breath. The dragon exhales repulsion energy in a 30-foot cone. Each creature in that area must succeed on a DC 15 Strength saving throw. On a failed save, the creature is pushed 40 feet away from the dragon.