Undead Fortitude. If damage reduces the zombie goblin 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 1 hit point instead

Clumsy. When a zombified goblin is hit by bludgeoning or force damage it must make a Constitution saving throw. On a 1-5 it falls prone, on a 6-10 it is pushed back 5 ft., on an 11-20 nothing happens.

Pack Tactics. The zombified goblin has advantage on an attack roll against a creature if at least one of the zombified goblin's allies is within 5 feet of the creature and the ally isn't incapacitated.

Light Sensitivity. When the zombified goblin is in bright light it has disadvantage on attack rolls.

Slam. Melee Weapon Attack: +3 to hit, reach 5 ft., one target. Hit: 4 (1d6 + 1) bludgeoning damage.

Scimitar. Melee Weapon Attack: +2 to hit, reach 5 ft., one target. Hit: 5 (1d6 + 2) slashing damage.