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The Ancient Blue Dragon is a Gargantuan dragon, lawful evil with the following characteristics:

. This creatures statististics are as follows:
- Armor Class: 22 (Natural Armor)- Hit Points: 481 (26d20 + 208) - Speed: 40 ft., burrow 40 ft., fly 80 ft. - Skills: Perception +17, Stealth +7- Senses: Blindsight 60 ft., Darkvision 120 ft.,  Passive Perception 27- Languages: Common, Draconic- Challenge Rating: 23 (50,000 XP)- Strength: 29 - Dexterity: 10 - Constitution: 27 - Intelligence: 18 - Wisdom: 17 - Charisma: 21 
The Ancient Blue Dragon has the following special abilities:
 <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 Blue 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> +16 to hit, reach 15 ft., one target. <em>Hit:</em> 20 (2d10 + 9) piercing damage plus 11 (2d10) lightning damage. </p><p><em><strong>Claw.</strong></em> <em>Melee Weapon Attack:</em> +16 to hit, reach 10 ft., one target. <em>Hit:</em> 16 (2d6 + 9) slashing damage. </p><p><em><strong>Tail.</strong></em> <em>Melee Weapon Attack:</em> +16 to hit, reach 20 ft., one target. <em>Hit:</em> 18 (2d8 + 9) 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 20 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>Lightning Breath (Recharge 5–6).</strong></em> The dragon exhales lightning in a 120-­-foot line that is 10 feet wide. Each creature in that line must make a DC 23 Dexterity saving throw, taking 88 (16d10) lightning damage on a failed save, or half as much damage on a successful one.</p>The Ancient Blue 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 24 Dexterity saving throw or take 16 (2d6 + 9) bludgeoning damage and be knocked prone. The dragon can then fly up to half its flying speed.</p>