User blog comment:FairyRaven/Fairy Tail Chapter 465: 400 Years, Review and Commentary/@comment-25334245-20151207125618

So layla dies/got sick from opening the gate? Yukino and Lucy were okay - was it bacuse there were 2 of them or maybe had all the keys instead of a few? And if all keys are needed, then how come lucy was only passed on 3? This part I am a bit confused on timelines for.

Also, if the dragon slayers came from the past, I do not think they would be over 400, its not like they were frozen in time like those on tenrou....they used a device to move through time.