Ancient Necrotic Dragon

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> ## Ancient Necrotic Dragon
>*Gargantuan Dragon, Lawful Evil*
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> - **Armor Class** 22 (natural armor)
> - **Hit Points** 500 
> - **Speed** 30ft **Swim** 40ft **Fly** 80ft
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>|STR|DEX|CON|INT|WIS|CHA|
>|:---:|:---:|:---:|:---:|:---:|:---:|
>|30 (+10)|12 (+1)|29 (+9)|18 (+4)|18 (+4)|21 (+5)|
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> - **Saving Throws** Dex +6, Con +16, Wis +10, Cha +13
> - **Skills** Insight +10, Intimidation +12, Perception + 17, Persuasion +11
> - **Damage Resistances** Radiant, non-magical bludgeoning, piercing and slashing damage
> - **Damage Immunities** Necrotic
> - **Senses** Darkvision 150ft, Blindsight 60ft, Passive Perception 27
> - **Languages** Abyssal, Common, Draconic, Infernal, Primordial
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>
> ***Black Aura.*** Any creature hostile to the dragon that starts its turn within 30 feet of him must make a DC 23 Constitution saving throw, unless the dragon is incapacitated. Unless the save succeeds, the creatures takes 3d6 necrotic damage, halved on success.
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> ***Legendary Resistance 3/Day*** If the dragon fails a saving throw, it can choose to succeed instead.
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> ### **Actions**
> ***Multiattack***. The dragon can make three attacks: two with its wings and one with his bite or tail. 
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> ***Bite.*** Melee Weapon Attack: +17 to hit, reach 15 ft., one target. Hit: 2d10 + 10 piercing damage plus 4d6 necrotic damage.
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> ***Wings***. Melee Weapon Attack: +17 to hit, reach 10ft.,
one target. Hit: 2d6+10 slashing damage. The dragon flies up to half its speed when attacking with its wings.
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> ***Tail***. Melee Weapon Attack: +17 to hit, reach 20 ft.,
one target. Hit: 2d8+10 bludgeoning damage. 
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> ***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 24 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.
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> ***Inferno Fire Blast. (Recharge 5-6)*** The dragon exhales a giant darkened fireball that strikes in a 30-foot radius area. Each creature in that area must make a DC 24 Dexterity saving throw, taking 13d6 necrotic damage + 13d6 fire damage on a failed save, or half as much damage on a successful one.
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> ### **Legendary Actions**
> The dragon can take 3 legendary reactions, 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
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> ***Bite/Wing/Tail Attack.*** The dragon makes a bite, wing, or tail attack.
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> ***Dark Insight (Cost 2 Actions).*** A creature of the dragon's choice that is within 60 feet of the dragon it can see must succeed on a DC 24 Wisdom saving throw, on failure, the creature have disadvantage on all rolls against the dragon for 1 minute. The creature can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success. If the creature's saving throw is successful or the effect ends for it, the creature is immune to the dragon's Dark Insight for the next 24 hours.
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