Vaan, Ashe, and the others must escape imprisonment by the Archadian Empire in their quest to reclaim Dalmasca. Meanwhile, Penelo is taken hostage at Bhujerba by Ba'Gamnan in hopes of luring the party into the Lhusu Mines, where a trap has been laid. There, the party meets a particularly well-mannered boy who addresses himself as "Lamont" and seeks answers to what fiendish schemes the Empire is brewing. Ba'Gamnan pursues them, yet they manage to escape.
"Lamont" is none other than Larsa Ferrinas Solidor, the second in line to the Imperial throne. Unlike the Empire he serves, he is a diplomat in the making, and thus seeks a peaceful solution to the war now underway. He takes Penelo to his quarters at Mqs. Halim Ondore IV's estate, where she learns of his intentions and gains his trust before an Archadian detachment retrieves him the next day. From then on, Larsa offers his aid to the party as he is able.
As Ashe seeks out the Dawn Shard to reclaim her throne, the party is recaptured aboard the Shiva, and the Dawn Shard seized by Ghis. This, in turn, leads to the sinking of the Archadian 8th Fleet as the Shard explodes in a fiery Mist.