Blood Moon

Everyone has two tally marks on their wrist. One is for your soul best friend. One is for your soul mate.

She's trained her entire life to fight his pack.
He has waited his entire life for this fight against her people.

Lily Borden is a vampire from a well respected family that leads the entire vampire army.
Grey has been following in his father's footsteps, until he is assassinated.
War is declared.

They meet in battle, and realize, they're soul mates.