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The Ancient Black Dragon is a Gargantuan dragon, chaotic evil with the following characteristics:

. This creatures statististics are as follows:
- Armor Class: 22 (Natural Armor)- Hit Points: 367 (21d20 + 147) - Speed: 40 ft., fly 80 ft., swim 40 ft. - Skills: Perception +16, Stealth +9- Senses: Blindsight 60 ft., Darkvision 120 ft.,  Passive Perception 26- Languages: Common, Draconic- Challenge Rating: 21 (33,000 XP)- Strength: 27 - Dexterity: 14 - Constitution: 25 - Intelligence: 16 - Wisdom: 15 - Charisma: 19 
The Ancient Black Dragon has the following special abilities:
 <p><em><strong>Amphibious.</strong></em> The dragon can breathe air and water.</p><p><em><strong>Legendary Resistance (3/Day).</strong></em> If the dragon fails a saving throw, it can choose to succeed instead.</p>The Ancient Black Dragon can take the following actions:
 <p><em><strong>Multiattack.</strong></em> The dragon can use its Frightful Presence. It then makes three attacks: one with its bite and two with its claws.</p><p><em><strong>Bite.</strong></em> <em>Melee Weapon Attack:</em> +15 to hit, reach 15 ft., one target. <em>Hit:</em> 19 (2d10 + 8) piercing damage plus 9 (2d8) acid damage.</p><p><em><strong>Claw.</strong></em> <em>Melee Weapon Attack:</em> +15 to hit, reach 10 ft., one target. <em>Hit:</em> 15 (2d6 + 8) slashing damage.</p><p><em><strong>Tail.</strong></em> <em>Melee Weapon Attack:</em> +15 to hit, reach 20 ft., one target. <em>Hit:</em> 17 (2d8 + 8) bludgeoning damage.</p><p><em><strong>Frightful Presence.</strong></em> 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.</p><p><em><strong>Acid Breath (Recharge 5–6).</strong></em> 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.</p>The Ancient Black Dragon can take the following legendary actions:
 <p>The dragon can take 3 legendary actions, choosing from the options below. Only one legendary action option can be used at a time and only at the end of another creature's turn. The dragon regains spent legendary actions at the start of its turn.</p><p><em><strong>Detect.</strong></em> The dragon makes a Wisdom (Perception) check.</p><p><em><strong>Tail Attack.</strong></em> The dragon makes a tail attack.</p><p><em><strong>Wing Attack (Costs 2 Actions).</strong></em> The dragon beats its wings. Each creature within 15 feet 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.</p>