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

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

Magic Weapons. Abadrion’s weapon attacks are magical.

Multiattack. Abadrion makes three attacks: one with its longsword and two with its whip.

Longsword. Melee Weapon Attack: +10 to hit, reach 10 ft., one target. Hit: 17 (2d10 + 6) piercing damage plus 3 (1d6) fire damage.

Whip. Melee Weapon Attack: +10 to hit, reach 5 ft., one target. Hit: 13 (2d6 + 6) slashing damage.

Fire Breath (Recharge 5–6). Abadrion exhales fire in a 30-foot cone. Each creature in that area must make a DC 17 Dexterity saving throw, taking 56 (16d6) fire damage on a failed save, or half as much damage on a successful one.

Abadrion 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. Abadrion makes a Wisdom (Perception) check.

Tail Attack. Abadrion makes a tail attack.

Wing Attack (Costs 2 Actions). Abadrion beats his wings. Each creature within 10 feet of Abadrion must succeed on a DC 22 Dexterity saving throw or take 15 (2d6 + 8) bludgeoning damage and be knocked prone. Abadrion can then fly up to half its flying speed.