In this battlefield, you have the ability to start the process of the recruiting of a certain character. You're familiar with the character, but I won't say the name; if you want said character, defeat Aegina, rescuing Flone, then finding out who the character is. You do not have to recruit the character after you save Flone, saving her merely allows it, it doesn't guarantee it. Roswell is the best for this job, considering the evilness of the Platinum Ornament, but just about anyone will do (but you'll want that Platinum Ornament). The best way to go about this is to send your selected character West, along the Flone Path, and Milanor East, along the Exit Path. You can still easily get the MVP bonus rescuing Flone, if you plan properly.