labyrinthos 2nd trip Side-quest:
Runaway Carbuncle: Quest start of with some guy looking for a missing carbuncle that was initially found wandering alone in La Nocea. When you get it the quest item mentions that you might recognize it and when you deliver it the guy says that it must have been summoned by a powerful arcanist...

God damn Tataru has been sustaining her carbuncle all this time, even from halfway across the world.