Caradon

Legendary Resistance (5/Day). If Caradon fails a saving throw, it can choose to succeed instead.

Siege Monster. Caradon deals double damage to all objects and structures.

Magic Resistance. Caradon has advantage on all saving throws against spells and all other magical effects.

Electrified Aura. At the beginning of the round, any creature within one mile of Caradon must make a constitution saving throw with a DC of 25 or take 38 (4d12) lightning damage. It can absorb it to instantly recharge it's Lich Bolt.

Magical Attacks. All attack made by Caradon are considered magical.

Multiattack. Caradon can use its Frightful Presence. It then makes four attacks: one with its bite, two with its claws, and one with it's tail.

Bite. Melee Weapon Attack: +27 to hit, reach 500 ft., one target. Hit: 180 (18d12 + 30) piercing damage plus 74 (10d12) lightning damage.

Claw. Melee Weapon Attack: +27 to hit, reach 500 ft., one target. Hit: 121 (15d10 + 20) slashing damage.

Tail. Melee Weapon Attack: +27 to hit, reach 700 ft., one target. Hit: 146 (18d10 + 30) bludgeoning damage. The target is knocked back 100 feet and is considered prone.

Frightful Presence. All creatures which can see Caradon must succeed on a DC 25 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 Caradon's Frightful Presence for the next 24 hours.

Lich Bolt (Recharge 5–6). Caradon exhales lightning in a three mile line that is 100 feet wide. Each creature in that line must make a DC 27 Dexterity saving throw, taking 212 (30d12) lightning damage on a failed save, or half as much damage on a successful one. This attack treats all immunities as resistances, and treats all resistances as if they did not exist.

Dragon's Graveyard. Caradon lets off an eerie aura, felt by all creatures within a mile. Moments later, the skeletons of any dragon which reside within the one-mile radius are resurrected as Dracolich's under Caradon's command. Up to three dragons can be summoned per action spent on this move.

The dragon 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. Caradon regains spent legendary actions at the start of its turn.

Detect. Caradon makes a Wisdom (Perception) check.

Tail Attack. Caradon makes a tail attack.

Wing Attack (Costs 2 Actions). Caradon beats its wings. Each creature within 1000 feet of the dragon must succeed on a DC 27 Dexterity saving throw or take 90 (12d10 + 30) bludgeoning damage and be knocked prone. Caradon can then fly up to half its flying speed.

Bite Attack (Costs 2 Actions). Caradon makes a bite attack.

Lich Bolt (Costs 3 Actions). Caradon diminishes it's Electrified Aura and uses it to recharge it's Lich Bolt if it is not charged already. It proceeds to use it's breath weapon, Lich Bolt.