Young Blue Dragon
Large dragon, lawful evil
STR
21
DEX
10
CON
19
INT
14
WIS
13
CHA
17
Armor Class: 18
Hit Points: 152 (16d10+64)
Speed: Walk 40 ft., Swim
Challenge Rating: 9 (5000 XP)
Saving Throws: Dex +4 Con +8 Wis +5 Cha +7
Skills: Perception +9 Stealth +4
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 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.