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Ancient Black Dragon

Challenge 21 (33,000 XP), Gargantuan dragon , chaotic evil

HP 367 (21d20) AC 22 SPD 40 ft., fly 80 ft., swim 40 ft.

Ability Scores
STR DEX CON INT WIS CHA
27 (+8) 14 (+2) 25 (+7) 16 (+3) 15 (+2) 19 (+4)
Skills
Perception: +16, Stealth: +9
Senses
Blindsight 60 ft., darkvision 120 ft., passive perception 26
Languages
Common, draconic
Damage Immunities
acid
Amphibious
The dragon can breathe air and water.
Legendary Resistance (3/Day)
If the dragon fails a saving throw, it can choose to succeed instead.
Legendary Resistance (3/Day)
If the dragon fails a saving throw, it can choose to succeed instead.

Actions

Multiattack
The dragon can use its Frightful Presence. It then makes three attacks: one with its bite and two with its claws.
Bite
Melee Weapon Attack:+ 15 to hit, reach 15 ft., one target. Hit: 19 (2d10 + 8) piercing damage plus 9 (2d8) acid damage.
Claw
Melee Weapon Attack: +15 to hit, reach 10 ft., one target. Hit: 15 (2d6 + 8) slashing damage.
Tail
Melee Weapon Attack: +15 to hit, reach 20 ft ., one target. Hit: 17 (2d8 + 8) bludgeoning damage.
Frightful Presence
Each creature of the dragon's choice that is within 120 feet of the dragon and aware of it must succeed on a DC 19 Wisdom saving throw or become frightened for 1 minute. A creature can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success. If a creature's saving throw is successful or the effect ends for it, the creature is immune to the dragon's Frightful Presence for the next 24 hours.
Acid Breath (Recharge 5-6)
The dragon exhales acid in a 90-foot line that is 10 feet wide. Each creature in that line must make a DC 22 Dexterity saving throw, taking 67 (15d8) acid damage on a failed save, or half as much damage on a successful one.

Legendary Actions

Detect
The dragon makes a Wisdom (Perception) check.
Tail Attack
The dragon makes a tail attack.
Wing Attack (Costs 2 Actions)
The dragon beats its wings. Each creature within 15 ft. of the dragon must succeed on a DC 23 Dexterity saving throw or take 15 (2d6 + 8) bludgeoning damage and be knocked prone. The dragon can then fly up to half its flying speed.

D&D 5E SRC

Monster Cards