Metamorphosis will happen depending on your life choices if some unworldly force decides if you are worthy of it, by age 13, you will feel an odd sensation on your birthday in the early light of the break of dawn, you cannot stop it, only accept it and wish that you don't get killed during your time of vulnerability by loved ones, or by your future species. After a full week, you will exit, and you will have become what your choices have created, whether you are a killing machine or at peace.