Juvenile Blue Dragon (5e Creature)
From D&D Wiki
Juvenile Blue Dragon
Large dragon, lawful evil
Saving Throws Dex +4, Con +9, Int +6, Wis +6, Cha +8
Multiattack. The dragon makes three attacks: one with its bite and two with its claws.
Bite. Melee Weapon Attack: +10 to hit, reach 10 ft., one target. Hit: 17 (2d10 + 6) piercing damage plus 5 (1d10) lightning damage.
Claw. Melee Weapon Attack: +10 to hit, reach 5 ft., one target. Hit: 13 (2d6 + 6) slashing damage.
Lightning Breath (Recharge 5-6). The dragon exhales lightning in a 60-foot line that is 5 feet wide. Each creature in that line must make a DC 17 Dexterity saving throw, taking 55 (10d10) lightning damage on a failed save, or half as much damage on a successful one.