based on D&D 5th Edition
Ancient Black Dragon
Gargantuan  Dragon , Chaotic Evil

Armor Class 22  (natural)
Hit Points 367  (21d20+147)
Speed 40 ft. , fly 80 ft. , swim 40 ft.



STR DEX CON INT WIS CHA
27  (+8) 14  (+2) 25  (+7) 16  (+3) 15  (+2) 19  (+4)
Saving Throws Dex +9, Con +14, Wis +9, Cha +11
Damage Immunities Acid
Senses blindsight,darkvision, passive Perception 26
Languages Common, Draconic
Challenge 21  (27500 XP)
Legendary Resistance. (3/day) automatic succeed on save after failure.
Actions
Multiattack. Uses Frightful Presence, then makes one bite and two claw attacks.
Bite. Melee Weapon Attack: +14 to hit, reach 15 ft., one target. Hit: 19 (2d10 +8) piercing damage.
Bite+. plus 9 (2d8) acid damage.
Claw. Melee Weapon Attack: +14 to hit, reach 10 ft., one target. Hit: 15 (2d6+8) slashing damage.
Tail. Melee Weapon Attack: +14 to hit, reach 20 ft., one target. Hit: 17 (2d8 +8) bludgeoning damage.
Acid Breath. (Recharge 5-6) DC 22 dexterity saving throw, half damage on successful save, for 67 (15d8) acid damage in 90 ft. Line
Frightful Presence. DC 19 Wisdom saving throw, frightened. Save at end of each turn, successful save creature becomes immune. in 120 Area
Wing Attack. DC 23 dexterity saving throw or take damage and knocked prone., for 15 (2d6+8) bludgeoning damage in ft. Melee