Young Blue Dragon

Large Dragon, lawful evil

Armor Class 18 (natural armor)

Hit Points 152 (16d10+64)

Speed fly +80, walk +40, burrow +40

Challenge 9

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 stealth +4, perception +9

Damage 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 (Recharge 5-6). 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.

Source: 5e Core Rules · OGL/Open