Bridgepuddle Undead (Type I)

Undead Fortitude. If damage reduces the creature 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.

Multiattack: The creature can make a Claw and Bite attack as the same Action.
Claw: melee weapon attack: +4 to hit, reach 5 ft., one target. Hit: 4 (1d4+2) slashing damage
Bite: melee weapon attack: +5 to hit, reach 5 ft., one target. Hit: 6 (2d6) piercing damage

Overwhelm: If an enemy adjacent to the zombie makes an attack that does not include thezombie as a target, the zombie can make a bite attack against the enemy as a Reaction.