Multiattack.The wyvern 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 (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 10 ft., one creature.
Hit:11 (2d6 + 4) piercing damage. The target must make a DC 15 Constitution saving throw, taking 24 (7d6) poison damage on a failed save, or half as much damage on a successful one.
Zombies are corpses imbued with a semblance of life, retaining no vestige of their former selves.
Undead Fortitude. If damage reduces the zombie to 0 hit points, it can make a Constitution saving throw with a DC of 5 + the damage taken, unless the damage is radiant or from a critical hit. On a success, the zombie drops to 1 hit point instead.,,
Slam. Melee Weapon Attack: +3 to hit, reach 5 ft., one target.
Hit: 4 (1d6 + 1) bludgeoning damage.