Cabbelerox

Baby Steps. When Cabbelerox drops to 0 hit points or dies, his body is destroyed but his essence is preserved in a purple dragon egg.

Innate Spellcasting (3/Day). Cabbelerox can innately cast meteor swarm. His spellcasting ability is Charisma.

Legendary Resistance (6/Day). If Cabbelerox fails a saving throw, he can choose to succeed instead.

Mage Guard Scales. Unless he wishes to be affected, Cabbelerox  is immune to spells of 6th level or lower. He has advantage on saving throws against all other spells and magical effects. When he is reduced to 0 HP his HP return to maximum and he loses this ability. 

Magic Weapons. Cabbelerox’s weapon attacks are magical.

Lord of Chaos and Entropy. When anyone takes damage from Cabbelerox they roll a 1D10 on the table below to determine what type the damage is.

1. Psychic

2. Fire 

3. Thunder

4. Cold  

5. Necrotic

6. Poison

7. Acid

8. Radiant

9. Lightning

10. Force

Whenever damage is done to Cabbelerox roll on the above table to see what type of damage is done. This ability is lost when Mage Guard Scales is lost. 

Regeneration. If Cabbelerox  has at least 1 hit point, he regains 75 hit points at the start of his turn.

Form Lock. Cabbelerox is immune to polymorph and any magic or effect that would change his form or size.

Multiattack. Cabbelerox can use his Frightful Presence. He then makes four attacks: two with his claws, one with his tail and one Entropy Bolt. 

Claw. Melee Weapon Attack: +19 to hit, reach 25 ft., one target. Hit: 24 (4d6 + 10) slashing damage.

Tail. Melee Weapon Attack: +19 to hit, reach 50 ft., one target. Hit: 28 (4d8 + 10) piercing damage.

Entropy Bolt: A plume of purple energy strikes out as a ranged attack, range of 150 ft, +17 to hit. On a hit does 65 (10d12) damage. 

Frightful Presence. Each creature of Cabbelerox’s choice that is within 240 feet of Him and aware of him must succeed on a DC 26 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 Cabbelerox’s Frightful Presence for the next 24 hours.

Draconic Denial; 3/day Cabbelerox can nullify a critical. 

Cabbelerox can take 5 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. Cabbelerox regains spent legendary actions at the start of his turn.

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Bite. Melee Weapon Attack: +19 to hit, reach 20 ft., one target. Hit: 32 (4d10 + 10) slashing damage plus 14 (4d6) acid damage (black dragon head), lightning damage (blue dragon head), poison damage (green dragon head), fire damage (red dragon head), or cold damage (white dragon head).

Constitution  (Costs 2 Actions). Cabbelerox breathes in a 120-foot line that is 10 feet wide. Each creature in that line must make a DC 27 Constitution  saving throw, taking 67 (15d8) damage on a failed save, or half as much damage on a successful one.

 Strength (Costs 2 Actions). Cabbelerox breathes in a 120-foot line that is 10 feet wide. Each creature in that line must make a DC 27 Strength saving throw, taking 88 (16d10) damage on a failed save, or half as much damage on a successful one.

Charisma  (Costs 2 Actions). Cabbelerox  breathes in a 90-foot cone. Each creature in that area must make a DC 27 Charisma saving throw, taking 77 (22d6)  damage on a failed save, or half as much damage on a successful one.
Wisdom (Costs 2 Actions). Cabbelerox breathes in a 90-foot cone. Each creature in that area must make a DC 27 Wisdom saving throw, taking 91 (26d6) damage on a failed save, or half as much damage on a successful one.

Dexterity (Costs 2 Actions). Cabbelerox breathes in a 90-foot cone. Each creature in that area must make a DC 27 Dex saving throw, taking 72 (16d8) cold damage on a failed save, or half as much damage on a successful one.

Intelligence (Costs 2 Actions). Cabbelerox breathes in a 90-foot cone. Each creature in that area must make a DC 27 Intelligence saving throw, taking 91 (26d6) damage on a failed save, or half as much damage on a successful one.

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Pulse of Destruction - 1 charge - As an action Cabbelerox let’s out a pulse of pure destructive force targeting everybody within 500 ft. Each target makes a saving throw of thier choice. If they fail they take 100 damage, are knocked from the sky if aloft or prone if grounded. They may not cast spells until the end of their next turn. 
Half damage on a successful save.

This ability recharges once after Mage Guard Scales is lost.