Gate of Memoirs/A Piece of Stone?

After defeating a tough enemy, Lugina finds a treasure chest. The only thing inside is a stone fragment, but...
Portrait 	Dialogue
Music: "Holy Place"	Music: "Holy Place"
 	
*Lugina: Heh, that wasn't as hard as I thought.
 	
*Lugina: Huh? Looks like there's a treasure chest here.
*Lugina: ..................
 	
*Lugina: What's this?
*Lugina: It's just some piece of rock.
 	
*Lugina: Tsch, whatever.
*Lugina: It was pretty heavily guarded...
*Lugina: ...so there's no way it's just some crummy old stone.
*Lugina: I'll take it with me, just in case.