Keen Hearing and Smell. The Alpha Werewolf has advantage on Wisdom Perception checks that rely on hearing or smell.

Spellcasting. The Alpha Werewolf is a 16th-level spellcaster. Its spellcasting ability is Wisdom (spell save DC 17, +9 to hit with spell attacks). The Alpha Werewolf has the  following Ranger spells prepared:

1st level (4 slots): Cure Wounds, Hunter's Mark

2nd level (3 slots): Pass Without a Trace, Silence, Spike Growth

3rd level (3 slots): Wind Wall, Protection from Energy, Water Walking

4th level (2 slots): Grasping Vine

Multiattack. The alpha werewolf makes three attacks: one with its bite and two with its claws.

Bite. Melee Weapon Attack: +10 to hit, reach 5 ft., one target. Hit: 25 (4d8 + 5) piercing damage. If the target is a humanoid, it must succeed on a DC 16 Constitution saving throw or be cursed with werewolf lycanthropy.

Claws. Melee Weapon Attack: +10 to hit, reach 5 ft., one creature. Hit: 17 (3d6 + 5) slashing damage.

Howl of the Wild. The Alpha Werewolf can howl as an action and call 1d6 wolves in as allies, the wolves show up at the end of the Alpha Werewolf's next turn