Keen Smell. The zombified bear has advantage on Wisdom (Perception) checks that rely on smell.

Strong Will. The zombified bear has advantage on constitution checks and are immune to charming

Multiattack. The zombie bear makes two attacks: one with its bite and one with its claws.

Bite. The zombie bear attempts to bite one creature within a 5 foot range. When bitten, this deals 1d6 piercing damage, and starting at the bears next turn, it will start dealing 1d4 poison damage every other round.

Claws. The zombie bear claws at one creature within a 5 foot range. On a hit, this deals 1d8 slashing damage.