Young Blue Dragon

Large dragon, lawful evil

Armor Class 18 (natural)

Hit Points 152 (16d10+64)

Speed walk 40 ft., burrow 20 ft., fly 80 ft.

Challenge CR 9 (5000 XP) · Proficiency bonus +4

STR21+5

DEX10+0

CON19+4

INT14+2

WIS13+1

CHA17+3

Saving throws: DEX +4, CON +8, WIS +5, CHA +7

Skills: Perception +9, Stealth +4

Immunities: lightning

Senses: blindsight 30 ft., darkvision 120 ft., passive perception 19

Languages: Common, Draconic

Actions

Multiattack. The dragon makes three attacks: one with its bite and two with its claws.

Bite. Melee Weapon Attack: +9 to hit, reach 10 ft., one target. Hit: 16 (2d10 + 5) piercing damage plus 5 (1d10) lightning damage.

Claw. Melee Weapon Attack: +9 to hit, reach 5 ft., one target. Hit: 12 (2d6 + 5) slashing damage.

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 16 Dexterity saving throw, taking 55 (10d10) lightning damage on a failed save, or half as much damage on a successful one.