Adult Blue Dragon
huge dragon, lawful evil
AC 19
Initiative +0 (10)
HP 212 (17d12 + 102)
Speed 40 ft., Burrow 30 ft., Fly 80 ft.
Skills Perception +12, Stealth +5
Immunities lightning
Senses Blindsight 60 ft., Darkvision 120 ft. Passive Perception 22
Languages Common, Draconic
CR 16 (XP 15,000; PB +5)
Legendary Resistance (3/Day, or 4/Day in Lair). If the dragon fails a saving throw, it can choose to succeed instead.
Actions
Lightning Breath (Recharge 5-6). Dexterity Saving Throw: DC 19, each creature in a 90-foot-long, 5-foot-wide Line. Failure: 60 (11d10) Lightning damage. Success: Half damage.
Multiattack. The dragon makes three Rend attacks. It can replace one attack with a use of Spellcasting to cast Shatter.
Rend. Melee Attack Roll: +12, reach 10 ft. 16 (2d8 + 7) Slashing damage plus 5 (1d10) Lightning damage.
Spellcasting. The dragon casts one of the following spells, requiring no Material components and using Charisma as the spellcasting ability (spell save DC 18): - At Will: Detect Magic, Invisibility, Mage Hand, Shatter - 1e/Day Each: Scrying, Sending
Legendary Actions
Cloaked Flight. The dragon uses Spellcasting to cast Invisibility on itself, and it can fly up to half its Fly Speed. The dragon can't take this action again until the start of its next turn.
Sonic Boom. The dragon uses Spellcasting to cast Shatter. The dragon can't take this action again until the start of its next turn.
Tail Swipe. The dragon makes one Rend attack.
Adult Blue Dragon is from the System Reference Document 5.2.1 (“SRD 5.2.1”) by Wizards of the Coast LLC, used under the Creative Commons Attribution 4.0 International License. Full attribution is on the Licenses & Attribution page.