User blog comment:FairyRaven/Fairy Tail Chapter 435 & 436: The Cry of Victory & Memoirs, Review and Commentary/@comment-112.210.161.150-20150519041321/@comment-24228963-20150519104657

Layla Heartfilia knew about "The One Magic" so I think by knowing more about Layla Heartfilia we will know more about "The One Magic" or vice versa.