User blog comment:B214/High School DxD EX/@comment-122.180.235.81-20180216084952/@comment-92.80.254.221-20200129015046

It is rare, because in history so far there have been only 3, but these were considered monsters with mutant genes. If it would be so easy to get to that level only with work then everyone would reach that level. If you have no talent (potential / good genes), no matter how hard you work and strive, you will not reach a high level. Each of us has a limit, but that limit differs from one to the other