Young Blue Dragon

Large dragon · CR 9

Armor Class 18

Hit Points 152 (16d10+64)

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

STR 21 +5

DEX 10 +0

CON 19 +4

INT 14 +2

WIS 13 +1

CHA 17 +3

Saving Throws CHA+7, CON+8, DEX+4, WIS+5

Skills perception +9, stealth +4

Damage Immunities lightning

Senses blindsight30 ft., darkvision120 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/Ranged Weapon Attack: +9 to hit.: Melee Weapon Attack: +9 to hit, reach 10 ft., one target. Hit: 16 (2d10 + 5) piercing damage plus 5 (1d10) lightning damage.
Claw. Melee/Ranged Weapon Attack: +9 to hit.: Melee Weapon Attack: +9 to hit, reach 5 ft., one target. Hit: 12 (2d6 + 5) slashing damage.
Lightning Breath (Recharge 5-6). Melee/Ranged Weapon Attack: +0 to hit.: The dragon exhales lightning in an 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.