Björn the Bear

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

Improved Critical: The Bear's attack roll score a critical on a roll of 19 or 20 on the d20.

Battle Readiness: Has advantage in initiative rolls.

Indomitable: The Bear can reroll a saving throw it fails, but must use the new roll. Can't use again till long rest

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

Extra-attack: gain 1 extra attack can not use with muliattack.

Bite. Melee Weapon Attack: +9 to hit, reach 5 ft., one target. Hit: 9 (1d8 + 7) piercing damage.

Claws. Melee Weapon Attack: +7 to hit, reach 5 ft., one target. Hit: 12 (2d6 + 7) slashing damage.

Second Wind: As a bonus action regain hit points 1d10+ your level. Once you use the feature, the Bear must finish a short or long rest before it can do it again.