Mob of Zombies

If damage reduces the mob of zombies to 0 hit points, it must make a Constitution saving throw with a DC equal to the damage taken. On a success, the mob of zombies drops to 1 hit point instead.

The mob of zombies can move through any opening large enough for a Medium creature. The mob of zombies has advantage on Strength checks and saving throws, and disadvantage on Dexterity checks and Saving throws.

The mob of zombies makes two slam attacks

Melee Weapon Attack: +1 plus PB to hit, reach 5 ft., one target. Hit: 7 (2d6) bludgeoning damage. If the target is Medium or smaller, it is grappled (escape DC 11). Until this grapple ends, the target is restrained. The mob of zombies can only grapple up to two creatures at a time.