After returning to Numara in Disc 4, talk to Malkis at Numara's Artists' Salon. He wants to hire you to search for some Stone tablets. Chances are you already have the Tablet Fragments as you can pick them up even if you don't have the quest already but in case you don't here are the locations, so you can go back and get any you missed.
- Crimson Forest – Sorcerer's Shrine – Chamber of Stone Tablets - On the elevator that you don't put the rock on.
- The Great Ancient Ruins – Legacy of the Eastern Tribe – Go to the north west side of the room, ride the 1st platform north east get off and ride the 2nd south east get off and ride the 3rd platform south west the tablet is in a chest.
- The Great Ancient Ruins – Lunar Palace – This one is complicated, the short answerer is in a chest in the south western part of the room when you are Kaim (right before the 2 parties are joined up again).
Once you have all the tablets Malkis will give you your reward.