Blighted Brown Bear

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

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

Bite. Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 4 (1d8) necrotic damage and 4 piercing damage. The target must also make a DC 13 Constitution saving throw, and if it fails, the target suffers the poisoned condition for 1 minute. At the end of its turn, the target can repeat the saving throw, ending the poisoned effect on itself on a success.

Claws. Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 6 (2d6) necrotic damage and 4 slashing damage.

Aura of Spores. When a creature the bear can see moves into a space within 10 feet of it or starts their turn there, the bear can use its reaction to deal 3 (1d6) necrotic damage to that creature unless it succeeds on a DC 13 Constitution saving throw.