Afflicted Dire Wolf

Keen Hearing and Smell. The wolf has advantage on Wisdom (Perception) checks that rely on hearing or smell.

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

Afflicted. The monster has the afflicted status. Attacks do additional necrotic damage that ignores resistance, and can only be healed through long rest.

Decaying Body. If attacked by a piercing weapon, it has a chance of getting stuck (D10). The player must use an action to dislodge the weapon. STR save 10

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.

Multiattack. The Dire Wolf makes two bite attacks.

Bite. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 14 (3d6 + 3) piercing damage. If the target is a creature, it must succeed on a DC 13 Strength saving throw or be knocked prone. If the target is unnaflicted, it takes an additional (2d6) necrotic damage.