Young Blue Dragon

Large dragon, lawful evil

Armor Class: 18 (natural armor)
Hit Points: 152 (16d10+64)
Speed: 40 ft., burrow 40 ft., fly 80 ft.

STR: 21 (+5)
DEX: 10 (+0)
CON: 19 (+4)
INT: 14 (+2)
WIS: 13 (+1)
CHA: 17 (+3)

Saving Throws: Dex +4, Con +8, Wis +5, Cha +7
Skills: Perception +9, Stealth +4
Damage Immunities: lightning
Senses: blindsight 30 ft., darkvision 120 ft., passive Perception 19
Languages: Common, Draconic
Challenge: 9 (5,000 XP)
Proficiency Bonus: +4

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.

How many for your party

Copies of the young blue dragon (5,000 XP each) against a party of four characters of the same level. Build mixed fights in the encounter builder.

Number of Young Blue Dragon for each difficulty, party of four
Party level	Easy	Medium	Hard	Deadly
Level 6	—	—	1	2–20
Level 7	—	—	1	2–20
Level 8	—	1	—	2–20
Level 9	—	1	—	2–20
Level 10	—	1	—	2–20
Level 12	1	—	2	3–20

In these lists

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Questions

What CR is the Young Blue Dragon?

The Young Blue Dragon is challenge 9, worth 5,000 XP, with a proficiency bonus of +4.

How many hit points does the Young Blue Dragon have?

152 hit points (16d10+64), with AC 18 from natural armor.

How many should I use against four 6th-level characters?

Against four level 6 characters, 1 is hard by the encounter XP budget.