Crystalborne Wyvern (Redux)

Minor Magic Resistance. The wyvern has advantage on saving throws against spells of 3rd level or lower, along with similar magical effects.

Multiattack. The wyvern makes two attacks: one with its bite and one with its stinger. While flying, it can use its claws or Fireball in place of one other attack.

Bite. Melee Weapon Attack: +7 to hit, reach 5 ft., one creature. Hit: 11 (2d6 + 4) piercing damage.

Claws. Melee Weapon Attack: +7 to hit, reach 5 ft., one target. Hit: 13 (2d8 + 4) slashing damage.

Tail. Melee Weapon Attack: +7 to hit, reach 10 ft., one target. Hit: 11 (1d12 + 5) bludgeoning damage.

Fireball. Ranged Weapon Attack: +5 to hit, reach 30/100 ft., one target. Hit: 11 (2d8 + 2) fire damage.

Havoc (Recharge 5-6). The wyvern unleashes hidden arcane energies deep within it that makes it that for the next 4 rounds, the wyvern has advantage on all attack rolls and Strength and Constitution saving throws until the end of the spell duration. Additionally, at the start of each of the dragon's turns, it must make a DC 13 Constitution saving throw. On a failure, the dragon takes 6 force damage, and on a success, for that turn, the dragon's attacks all deal one extra damage die than they normally would.

Siege Lockdown (Recharge 5-6). The wyvern makes a Fireball attack on a siege weapon or Large or larger hostile creature that it can see within 90 ft of it. On a hit, the target takes no damage, but must succeed on a DC 15 Strength saving throw or be restrained for 1 minute. While restrained in this way, the target can't take reactions.