The Gift chronicles

When the Moon Goddess created the first werewolves, she split one soul between the two of them, thus cresting a perfect soulmate for every werewolf thereafter, known as their mate. Upon the birth of a werewolf, she assigns them with a supematural ability, known as their Gift. Ares is a killer. During the day, she is busy fulfilling her duties as the Gamma of her pack. However, before anyone wakes, she sneaks out to unclaimed territory and assassinates rogues to avenge her parents' murder. The Moon Goddess made the mistake of granting her the ability to materialize weapons at will, and Ares fully Intended to use har powers as much as she could to deal out vigilante justice. Cain, the cruel Alpha of the Blood Lake Pack, has given up on finding his mate. At 28 years old, it seems unlikely that he will ever find her. All hope is lest until he meets the shockingly violent Gamma from a neighboring pack. His only problem is, she won't go with him easily.