"Mostly 'people with magic exist' the presence of magic and how it is used can give some properties to some materials or species," Temps explains "but the effects aren't that noticeable, in my world they influence when mages want to enchant a magical item, and also had some effects on mages themselves, we are more likely to have twins and have very slightly better health, the last one is also a side effect of personal or Trader magic fixing genetic problems, I don't think it would affect mages from newly seeded worlds."