Inherit the Wolf

The latent curse of the lycanthropy lingers in your blood. It manifest in strange ways sending you into a bloodlust unlike any other. Whether it be when your instinctual fight reaction kicks in or under the glow of a full moon, the beast rears its head and bears its teeth on your mind.   When a creature with this feat has half it's hit points, it must make a DC 15 wisdom saving throw. On a success the creature maintains its senses, while in wolf form, the creature gains temp. hit points equal to it's level + Proficiency Bonus. 

On a failed save, the creature loses their senses and succumbs to the beast. Their strength score increases to 20 and have multi-attacks (2) with either claws or bites ,for the duration of their werewolf form, they are unable to use weapons and gain a vulnerability to silvered weapons. In this form, the creature must attack the closest target until they are reduced to 0 hit points then must move to the next target. 

(IF the character is a barbarian) 
At the end of your rage, make a Wisdom Saving throw (DC 15) on a success, reduce your next werewolf transformation DC by 5 on a failure, increase by 5. The failure may be negated by taking one point of exhaustion. 

The werewolf form remains for 10 minutes or until a successful save is made.