Alpha Werewolf

Shapechanger. The werewolf can use its action to polymorph into a wolf-humanoid hybrid or into a wolf, or back into its true form, which is humanoid. Its statistics, other than its AC, are the same in each form. Any equipment it is wearing or carrying isn't transformed. It reverts to its true form if it dies.

Keen Hearing and Smell. The werewolf has advantage on Wisdom (Perception) checks that rely on hearing or smell.

Heightened Predator. The Alpha Werewolf's senses are beyond a normal werewolf. The Alpha Werewolf can locate a creature through smell and sound. 

More beast than man. If the Alpha Werewolf downs a creature, it will feast upon the corpse. 

Pact Tactics. The Alpha Werewolf has advantage on an attack roll against a creature if at least one of the wolf's allies is within 5 feet of creature and the ally isn't incapacitated. 

Regeneration. The Alpha Werewolf regains 10 hit points at the start of its turn if it has at least 1 hit point (50 hit points if under the sway of the full moon). If the werewolf takes radiant damage or damage from holy water, or damage from a silvered weapon, this trait doesn't function at the start of the Alpha Werewolf's next turn. 

Alpha Werewolf Weaknesses. The Alpha Werewolf has the following flaws: 
Lunacy. The alpha werewolf has disadvantage on wisdom saving throws when under the influence of the full moon. 
Silver vulnerability. 
Wolfsbane. If a piercing weapon covered in wolfsbane causes injury, the alpha werewolf takes 44(8d10) of necrotic damage. If wolfsbane is ingested,double the damage.
Shocking State. If the Alpha Werewolf takes lightning damage, they cannot shapechange for a minute. The werewolf stays in their current form. 

Multiattack. (Humanoid or Hybrid Form Only). The werewolf makes three attacks: one with its bite and two with its claws or great-sword. 

Bite (Wolf or Hybrid Form Only). Melee Weapon Attack: +11 to hit, reach 5 ft., one target. Hit: 17 (2d10 + 6) piercing damage. If the target is a humanoid, it must succeed on a DC 15 Constitution saving throw or be cursed with werewolf lycanthropy.

Claws. (Wolf or Hybrid Form Only). Melee Weapon Attack: +11 to hit, reach 5 ft., one creature. Hit: 15 (2d8 + 6) slashing damage. Cursed wounds- At the start of each of the wounded creature’s turns, it takes 5(2d4) necrotic damage, and it can then make a DC 18 Constitution saving throw, ending the effect of all such wounds on itself on a success. Alternatively, the wounded creature, or a creature within 5 feet of it, can use an action to make a DC 15 Wisdom (Medicine) check, ending the effect of such wounds on it on a success. Magical healing will end the condition.

Great-sword (Humanoid /hybrid Forms Only). Melee Attack: +11 to hit, reach 5 ft., one creature. Hit: 20(4d6+ 6) piercing damage, or 24 (4d8 + 6) piercing damage if used with two hands to make a melee attack.

One of the Pack (1/Day). The Alpha Werewolf gains power based upon the size of the pack. Once per day, the Alpha Werewolf gains temporary +10 hit points for each creature infected with lycanthropy within sight. Each creature that increases the temporary hit points gains 10 temporary hit points as well. Each member that dies causes the Alpha take 15 points of damage. 

Consume Flesh.  Can only be used upon an unconscious creature. Melee attack, +11 to hit. The Alpha Werewolf regenerates 40 hit points on a hit.

Legendary Resistance (3/Day). If the Alpha werewolf fails a saving throw, it can choose to succeed instead.

Potent virus. The Alpha Werewolf bite requires a greater restoration spell to cure. A remedy can be made from wolf's bane (medicine DC 15) but must be administered before the next full moon. If a full transformation happens, it requires a wish spell to cure. A creature already contracted with lycanthropy is poisoned on a failed constitution saving throw. At the end of the creatures turn, they may make the saving throw again. 

Blood lust (Recharge 5-6)- The Alpha Werewolf unleashes a bloodcurdling howl. Creatures within 120ft infected by lycanthropy make a Wisdom saving throw 18. On a failure, the creature infected with lycanthropy frenzies. Each frenzied creature uses a bonus attack on the closest enemy next to them. If multiple, the enemy is chosen at random. If an enemy is infected with lycanthropy and misses their save, they attack a random creature closest to them. 

Can take 3 Legendary Actions, choosing from the options below. Only one legendary action can be used at a time, and only at the end of another creature's turn. Spent legendary actions are regained at the start of the Alpha's turn.

Transform: The Alpha Werewolf can shape-shift to any of its forms (humanoid, hybrid, wolf).

Predator's Grace: The Alpha Werewolf moves up to its speed without provoking Opportunity Attacks.

Maw of the beast (Costs 2 Actions) The Alpha WWerewolf makes one bite attack. 

Savage Evisceration (Costs 3 Actions): The Alpha Werewolf makes two cursed claw Attacks.