Multiattack

The wyvern makes one Bite attack and one Stinger attack. While flying, it can replace one attack with a Claws 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.

Stinger

_Melee Weapon Attack:_ +7 to hit, reach 15 ft., one creature. _Hit:_ 15 (2d10+4) piercing damage plus 18 (4d8) poison damage. The target must succeed on a DC 15 CON save or be poisoned for 1 minute. A poisoned creature can repeat the save at the end of each of its turns, ending the effect on itself on a success.