Large Dragon, lawful good
Armor Class 18 (natural armor)
Hit Points 142 (15d10+60)
Speed fly +80, swim +40, walk +40
Challenge 8
Saving Throws cha +6, con +7, dex +3, wis +4
Skills insight +4, stealth +3, perception +7
Damage Immunities lightning
Senses blindsight 30 ft., darkvision 120 ft., passive Perception 17
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: +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.
Source: 5e Core Rules · OGL/Open