We have a Segment Address to unlock. Use the EVS to go back to... You guessed it... Labyrinthos. Well, technically Old Miltia. But once you're there, make for Labyrinthos. Take the main elevator down, and just keep going until you reach the room with the Area 13 door on your right. Go through it, and go downstairs. You'll emerge right next to Segment Address 5. Inside is the EK FURY DEVICE. Another Erde Kaiser Ether! YES! Back on the Elsa, try the Expert HaKox stage, why don't you? I can do it :P C'mon. What have you got to lose?