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

Bite. Melee Weapon Attack: +7 to hit, reach 10 ft., one creature. Hit: 11 (2d10 + 4) piercing damage.

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

Flame breath. Melee Weapon Attack: +7 to hit, reach 10 ft., one creature. Hit: 11 (2d20 + 4) flame damage. The target must make a DC 15 Dexterity saving throw, taking 24 (7d10) fire damage on a failed save, or half as much damage on a successful one.