Obtained: Speak with Senna at Uptown in chapter II
Rewards: Ether+ x3, 500 Lums
Heal Oro, Samoanna and Tamatoa in Peyska Spring
Travel to Peyska Spring and speak with Oro near the train station in area 1. Head a little farther east to find Samoanna standing next to Vaipoe then speak with her.
Heal Tamatoa in Peyska Spring
Travel to area 2 and speak with Tamatoa near the entrance to the sewers.
Go back to talk to Senna in Uptown
Return to Harmonia and speak with Senna.
Talk to Aonghas in Arsion
Speak with him in the Weapon Shop.
Find the Migmie in the Blazing Fields
Head to the Blazing Fields from Arsion and you’ll find a shiny object on the ground. Pick it up to retrieve a book.
Go back to talk to Senna in Uptown
Speaking with her will complete the quest!