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 1 hit point instead.

 Optional ruling. Infectious bite. If a creatur is bitten by the werwolf Zombie  the targed needs to make an DC ( Constitution) against 14 or gets infectet ( roll a D4  for  1 left leg 2 right leg 3 right Arm 4 Left Arm)     the infection will spread to the body. and only can be removed by greater resturection spell or by cuttin of the infected limb.  if a  Character dies while infected.  it gets resurected under the DMs control  and becomes an Zombie wewrwolf.

Multiattack.  The werewolf makes two attacks: two with its spear (humanoid form) or one with its bite and one with its claws (hybrid form).

Bite . Melee Weapon Attack: +4 to hit, reach 5 ft., one target. Hit: 6 (2d8 + 4) piercing damage. If the target is a humanoid, it must succeed on a DC 14 Constitution saving throw or be infected.

Claws.. Melee Weapon Attack: +4 to hit, reach 5 ft., one creature. Hit: 7 (3d4 + 3) slashing damage.