User blog comment:7-45 Fire/How Fairies came to be./@comment-31892545-20170812030640/@comment-26569404-20170812174922

All right then. I'm wrong. Acheron created the Legendarium World, but he didn't create the legends and characters that exist in it. All he did was bring them together in a single dimension.

In that case, the birth of fairies may be closer to how it is in World of Winx. Fantasy and imagination created them, and the Mythix power allowed them to become real somehow. But I'm not sure.