User blog comment:FairyRaven/Fairy Tail Chapter 465: 400 Years, Review and Commentary/@comment-5170433-20151207141753

I'm guessing that Anna is Layla's ancestor and Anna gave specific instructions to her descendants to open the gate at certain time. Gg. But Layla must have done something else because there's that Brandish debacle. What sort of crap did she get into? It also makes me very happy that my theory about the DS and Layla connection was pretty spot on