The definition of ultimate power (goku black reader x crossover)

Y/n was a student from union academy but later on was abused by the students and headmasters of the academy for reasons he has no power they continue to abuse ignoring insulting him while the headmasters were only paying attention more to their students until y/n has left the academy by the headmasters until y/n meet a kai who wants to eradicate all of humanity for his own image as a god his name is zamasu