This is an Final Fantasy Record Keeper (FFRK) in-game event. This is the first Final Fantasy Tactics (FFT) Event in which you could recruit Ramza and Agrias and get their Memory Crystal (MC) I and MC II. This is available from April 4,2016 5:00 PM PST / April 5, 2016 1:00 AM UTC up to April 16,2016 4:59 PM PST / April 17,2016 12:59 AM UTC.
You can also get these accessories:
The event details are:
When one dungeon is completed, the next will unlock.
Complete new dungeons to win rewards.