Monster

Ancient Blue Dragon

Gargantuan Dragon · Lawful Evil

Monster Manual (2024) Page 50

Source versions Monster Manual · p. 90 Monster Manual (2024) · p. 50

Armor Class22

Hit Points481 (26d20 + 208)

SpeedWalk 40 ft., Burrow 40 ft., Fly 80 ft.

Challenge23

STR29

DEX10

CON27

INT18

WIS17

CHA25

Traits

Legendary Resistance (4/Day, or 5/Day in Lair)

If the dragon fails a saving throw, it can choose to succeed instead.

Actions

Multiattack

The dragon makes three Rend attacks. It can replace one attack with a use of Spellcasting to cast (level 3 version).

Rend

Melee Attack +16, reach 15 ft. 18 () 🗡️ Slashing damage plus 11 () ⚡ Lightning damage.

Lightning Breath Recharge 5

DEX Save DC 23, each creature in a 120-foot-long, 10-foot-wide Line [Area Of Effect].
Failure: 88 () ⚡ Lightning damage.
Success: Half damage.

Legendary Actions

Cloaked Flight

The dragon uses Spellcasting to cast 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 (level 3 version). The dragon can't take this action again until the start of its next turn.

Tail Swipe

The dragon makes one Rend attack.