Undead Fortitude. If damage reduces the zombie to 0 hit points, it must 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 10 hit point instead.

wing assist . can jump an additional 15 feet on top of walking speed with the use of its one wing

Multiattack. 2 melee attacks: 1 with its scimitar or claw and one with its stinger. 

Claw. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 8 (1d8 + 3) slashing damage.

Scimitar. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 6 (1d6 + 3) slashing damage. The target must succeed on a dc10 constitution saving through or suffer (1d8) necrotic damage

Sting. Melee Weapon Attack: +5 to hit, reach 10 ft., one target. Hit: 13 (2d8 + 3) piercing damage plus 17 (3d6) poison damage, and the target must succeed on a DC 12 Constitution saving throw or become poisoned for 1 minute. The target can repeat the saving throw at the end of each of its turns, ending the effect on itself on a success.