The Aethervale

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monster

Ancient Blue Dragon

Ancient Blue Dragon
Ancient Blue Dragon
CR 23
Gargantuan Dragon (chromatic), Lawful Evil
Reveal Stat Block
Armor Class
22
Hit Points
481 (26d20 + 208)
Speed
40 ft., fly 80 ft., burrow 40 ft.
str
29
+9
dex
10
+0
con
27
+8
int
18
+4
wis
17
+3
cha
25
+7

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 Shatter|XPHB (level 3 version).
Rend.m 16, reach 15 ft. ({@damage 2d8 + 9) Slashing damage plus 11 (2d10) Lightning damage.
Lightning Breath 5.dex 23, each creature in a 120-foot-long, 10-foot-wide Line [Area of Effect]|XPHB|Line. 88 ( Half damage.
Legendary Actions.The creature can take 3 legendary actions...
Cloaked Flight.The dragon uses Spellcasting to cast Invisibility|XPHB on itself, and it can fly up to half its Fly Speed|XPHB. The dragon can't take this action again until the start of its next turn.
Sonic Boom.The dragon uses Spellcasting to cast Shatter|XPHB (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.