Ancient Dragon Lord

Legendary Resistance (3/Day). If the dragon fails a saving throw, it can choose to succeed instead.

Uncanny Speed. The dragon can take 2 separate initiative

Colossal. The dragon is immune to forced movement, does not provoke opportunity attacks and cannot make opportunity attacks. 

In addition, whenever the dragon makes a weapon attack, regardless of whether the attack hits or misses, each creature within 10 feet of the attack's target other than the target or the dragon itself must succeed on a DC 27 Dexterity saving throw or takes half the attack's damage.

Empowered Attacks. The dragon's weapon attacks count as magical for the purpose of overcoming resistance and immunity to nonmagical attacks.

Lighting Aura. The dragon is sheathed in Thunder and light. Whilst within 200ft of the dragon remove resistance or immunity to Lighting or Thunder damage .If Lighting or thunder damage targets or hits the dragon heals them instead.

The dragon Lords Horns. The dragon has 3 primary horns, each can take up 120 points of damage and must be directly targeted for damage to count:

• For each horn destroyed takeaway 15 from any lighting or plasma damage rolled
• The dragon can force any other visible dragon to make a DC 27 CHA check and be forced to follow its command. Cannot be used if 2 or more horns are destroyed
• If all horns are destroyed the dragon cannot use Plasma Breath or Storm Call and if there Storm Call ability is in uses then the storm is dispelled

Bite. Melee Weapon Attack: +18 to hit, reach 15 ft., one target. Hit: 26 (2d10 + 15) piercing damage plus 16 (3d10) lightning damage.

Claw. Melee Weapon Attack: +18 to hit, reach 10 ft., one target. Hit: 18 (2d8 + 9) slashing damage.

Tail. Melee Weapon Attack: +18 to hit, reach 20 ft., one target. Hit: 20 (2d10 + 9) 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 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.

Lightning Breath (Recharge 5–6). The dragon exhales lightning in a 250-­foot line that is 20 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.

Call Lightning (Recharge 5–6). The dragon exhales a blast target creature within in a 200-­foot then create a 40-feet shpere. Each creature in that line must make a DC 23 Dexterity saving throw, taking 64 (16d8) lightning damage on a failed save, or half as much damage on a successful one.

Plasma Breath (Recharge 9–10). Breath-The dragon exhales Plasma in a 100-­foot line that is 10 feet wide. Each creature in that line must make a DC 23 Dexterity saving throw, taking (18d10+20) Plasma damage and if killed is disintegrated  on a failed save, or half as much damage on a successful one.

Blast-The dragon exhales a blast Plasma targeting a place within 300 ft then create a 40ft sphere . Each creature in that sphere must make a DC 23 Dexterity saving throw, taking (18d10+20) Plasma damage and if killed is disintegrated on a failed save, or half as much damage on a successful one.

Storm Call (Recharge 99–100).  Call a thunder storm to a its location covering 3000ft lasting 5 days : 

• At the end every round can select 3 targets within the storm and not coved by terrain or a larger creature . Each target must make a DC 22 DEX save taking (4d8) lighting damage or take none on a successful save 
• All sources of lighting or thunder damage can add 2d8 Lighting damage to there attack

Crushing Landing. If the dragon is flying, it can attempt to land forcefully in a space of its choice, even if that space is occupied by other creatures. When it does so, its movement speed is reduced to 0 until the end of the turn, and each creature in the dragon's space or within 30 feet of it, other than the dragon itself, must make a DC 27 Dexterity saving throw or take 26 (4d12) bludgeoning damage plus 21 (6d6) Lighting damage and be knocked prone.

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.

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 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.