in this world everyone is born with a sword every birthday their sword gains a new ability. The person gets a choice of 3 abilities. Your twin sister willow evey year got a rare ability as a choice while you always got common abilities. So your parents take pride in willow and favors her but this year everything changed you were in your room while your parents and willow were downstairs throwing a birthday party for only willow. You finally got a ability that was better than rare it was ledgendary rank (or mythical) as one of your options