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System Reference Document 5.2.1
wide Line. Failure: 60 (11d10) Lightning damage. Suc-
cess: Half 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
1/Day Each: Scrying, Sending
Legendary Actions
Legendary Action Uses: 3 (4 in Lair). Immediately after 
another creature’s turn, the dragon can expend a use to 
take one of the following actions. The dragon regains all 
expended uses at the start of each of its turns.
Cloaked Flight. The dragon uses Spellcasting to cast In-
visibility 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 Shat-
ter. The dragon can’t take this action again until the 
start of its next turn.
Tail Swipe. The dragon makes one Rend attack.
Ancient Blue Dragon
Gargantuan Dragon (Chromatic), Lawful Evil
AC 22  Initiative +14 (24)
HP 481 (26d20 + 208)
Speed 40 ft., Burrow 40 ft., Fly 80 ft.
MOD SAVE MOD SAVE MOD SAVE
Str 29 +9 +9 Dex 10 +0 +7 Con 27 +8 +8
Int 18 +4 +4 WIS 17 +3 +10 Cha 25 +7 +7
Skills Perception +17 , Stealth +7
Immunities Lightning
Senses Blindsight 60 ft., Darkvision 120 ft.; 
Passive Perception 27
Languages Common, Draconic
CR 23 (XP 50,000, or 62,000 in lair; PB +7)
Traits
Legendary Resistance (4/Day, or 5/Day in Lair). If 
the dragon fails a saving throw, it can choose to suc-
ceed instead.
Actions
Multiattack. The dragon makes three Rend attacks. It 
can replace one attack with a use of Spellcasting to cast 
Shatter (level 3 version).
Rend. Melee Attack Roll: +16, reach 15 ft. Hit: 18 (2d8 
+ 9) Slashing damage plus 11 (2d10) Lightning damage.
Lightning Breath (Recharge 5–6). Dexterity Saving 
Throw: DC 23, each creature in a 120-foot-long, 
10-foot-wide Line. Failure: 88 (16d10) Lightning dam-
age. Success: Half damage.
Spellcasting. The dragon casts one of the following 
spells, requiring no Material components and using 
Charisma as the spellcasting ability (spell save DC 22):
At Will: Detect Magic, Invisibility, Mage Hand, Shatter 
(level 3 version)
1/Day Each: Scrying, Sending
Legendary Actions
Legendary Action Uses: 3 (4 in Lair). Immediately after 
another creature’s turn, the dragon can expend a use to 
take one of the following actions. The dragon regains all 
expended uses at the start of each of its turns.
Cloaked Flight. The dragon uses Spellcasting to cast In-
visibility 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 Shat-
ter (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.
Bone Devil
Bone Devil
Large Fiend (Devil), Lawful Evil
AC 16  Initiative +7 (17)
HP 161 (17d10 + 68)
Speed 40 ft., Fly 40 ft.
MOD SAVE MOD SAVE MOD SAVE
Str 18 +4 +8 Dex 16 +3 +3 Con 18 +4 +4
Int 13 +1 +5 WIS 14 +2 +6 Cha 16 +3 +7
Skills Deception +7 , Insight +6
Resistances Cold
Immunities Fire, Poison; Poisoned
Senses Darkvision 120 ft. (unimpeded by magical 
Darkness); Passive Perception 12
Languages Infernal; telepathy 120 ft.
CR 9 (XP 5,000; PB +4)
Traits
Diabolical Restoration. If the devil dies outside the 
Nine Hells, its body disappears in sulfurous smoke, and 
it gains a new body instantly, reviving with all its Hit 
Points somewhere in the Nine Hells.
Magic Resistance. The devil has Advantage on saving 
throws against spells and other magical effects.
Actions
Multiattack. The devil makes two Claw attacks and one 
Infernal Sting attack.
Claw. Melee Attack Roll: +8, reach 10 ft. Hit: 13 (2d8 
+ 4) Slashing damage.
Infernal Sting. Melee Attack Roll: +8, reach 10 ft. Hit: 
15 (2d10 + 4) Piercing damage plus 18 (4d8) Poison 