BloodDrinker the Bear

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

Improved Critical. 3rd-level Warrior feature - Attack rolls score a critical hit on a roll of 19 or 20 on the d20

Battle Readiness. 7th-level Warrior feature - Has advantage on Intiative rolls.

Improved Defense. 10th-level Warrior feature - Armor Class increases by 1.

Indomitable. 11th-level Warrior feature - Reroll a saving throw that it fails, but it must use the new roll. When it uses this feature, it can't use the feature again until it finishes a long rest. Can use this feature twice between long rests starting at 18th level.

Extra Attack. 6th-level Warrior feature - Attack twice, instead of once, whenever it takes the attack action on its turn. The number of attacks increases to three at 15th level. If it has multiattack action, it can use Extra Attack or Multiattack on a turn, not both.

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

Bite. Melee Weapon Attack: +7 to hit, reach 5 ft., one target. Hit: 5 (1d6 + 2) piercing damage.

Claws. Melee Weapon Attack: +7 to hit, reach 5 ft., one target. Hit: 7 (2d4 + 2) slashing damage.

Second Wind. 2nd-level Warrior feature - Use a bonus action on its turn to regain hit points equal to 1d10 + its level in this class. Once it uses this feature, it must finish a short or long rest before it can use it again.  Can use this feature twice between rests at 20th level.

Defender. BloodDrinker can use it's reaction to impose disadvantage on the attack roll of a creature within 5 feet of it whose target isn't the BloodDrinker, provided it can see the attacker.