Ash wolf

 Predatory Bearing. The wolf has advantage on attack rolls against any creature that has no allies within 5 feet of it.

Packbond. At initiative count 0, the wolf can change its initiative to that of a friendly creature it can see within 60 feet

Undying Embers. If the wolf would take any fire damage or begins its turn within 5 feet of an open flame, it instead takes no damage and regains 2 hit point. Additionally when a creature hits the wolf with a melee attack it takes 2 (1d4) fire damage.

Ashwalk. The wolf can walk across any surface of ash as if it weighed nothing.

 Snarling Snap. Melee Weapon Attack: +5 to hit, reach 5 ft., one target. Hit: 10 (2d6 + 3) piercing damage. This attack deals an additional 3 (1d6) fire damage to a target that is burning.

Instead of dealing damage, the wolf can grapple the target (escape DC 13). A target grappled in this way also begins burning (1d10).

Worry. The wolf tugs and tears at a creature grappled both by it and by one of the wolf's allies, forcing the target to make a DC 13 Constitution saving throw.

On a failure, the target takes 21 (6d6) piercing damage, or half as much on a success.

Dire Howl (1/Day). The wolf howls forth a shuddering cry; each creature of its choice within 30 feet that can hear it must succeed on a DC 12 Wisdom Saving throw or be Frightened until the end of its next turn.

A creature that fails this saving throw by 5 or more must use its reaction to move its speed directly away from the wolf, if available.

Unbalancing Tug. When a creature grappled by the wolf makes an attack or casts a spell, the wolf can force it to succeed on a DC 13 Strength saving throw or fall prone.