Bjorn, the Snowy Owlbear

Attacker. Bjorn gains a +2 bonus to attack rolls (included in the attack).

Improved Critical. Bjorn’s attack rolls score a critical hit on a roll of 19 or 20 on the d20.

Indomitable (1/Day). Bjorn can reroll a saving throw that he fails. He must use the new roll.

Keen Sight and Smell. Bjorn has advantage on Wisdom (Perception) checks that rely on sight or smell.

Magic Attacks. Bjorn's natural attacks count as magical for the purpose of overcoming resistance and immunity to nonmagical attacks and damage.

Mesikammen's Blessing. Bjorn has advantage on all saving throws against being frightened. Additionally, he regains 10 hit points at the start of his turn if he has at least 1 hit point.

Multiattack. Bjorn makes three attacks: one with his beak and two with his claws.

Beak. Melee Weapon Attack: +13 to hit, reach 5 ft., one creature. Hit: 17 (2d10 + 6) piercing damage.

Claws. Melee Weapon Attack: +13 to hit, reach 5 ft., one target. Hit: 15 (2d8 + 6) slashing damage.

Frost Strike (1/Turn). Bjorn channels the power of the frost into his next attack. Once per turn, on a successful hit with his beak or claws, Bjorn can use a bonus action to force the target to make a DC 18 Constitution saving throw. On a fail, the target takes an additional 9 (2d8) cold damage and is paralyzed until the end of Bjorn's next turn.

Second Wind (2/Day). Bjorn can use a bonus action on his turn to regain hit points equal to (1d10 + 15).

Guardian's Pounce. When an enemy within 30 feet of Bjorn hits an ally with an attack, Bjorn can use his reaction to move up to 30 feet toward the attacker and make one claw attack against it.

Protection. Bjorn imposes disadvantage on the attack roll of a creature within 5 feet of him whose target isn’t Bjorn. He must be able to see the attacker.

Bjorn can take 3 legendary actions, choosing from the options below. Only one legendary action option can be used at a time and only at the end of another creature's turn. Bjorn regains spent legendary actions at the start of his turn.

Attack. Bjorn makes one beak or claw attack.

Blizzard (Costs 3 Actions). Bjorn summons a localized blizzard in a 30-foot radius around him. The area becomes heavily obscured, and each hostile creature in the area must succeed on a DC 18 Constitution saving throw or take 14 (4d6) cold damage and have its movement speed halved until the end of its next turn. The blizzard lasts until the end of Bjorn's next turn.

Move. Bjorn moves up to his speed without provoking opportunity attacks.