ITEMS TO GET: None

   Return to the Thames and pay a visit the Armor Grounds. You'll automatically go into a scene introducing the Black family: Primera, Jessie, and Billy. Afterwards, go back to the Yggdrasil and talk to Sigurd. He'll now let you control the Yggdrasil, and you can sail around (you can only get off at beaches, though). Don't go anyway right now, though; instead, go down to Margie's room and talk to her. She'll allow you to change party members. You're stuck with Elly, but put Bart and Citan in as your other characters.

   Take control of the Yggdrasil and leave the Thames. Note that you do fight enemies at sea, but they're pretty easy (you can take them all out with one Aerods). Just watch out for the Death Scythes; you can only hurt them with Deathblows. Use Triangle attacks (they use less fuel) to build up your attack level, then let them have it.

   Sail due north until you reach the Ethos HQ (you can also go to the Orphanage and Babel Tower, but there's nothing to do at eithr of them). You'll have to land on the west side of the island with the HQ, then cross it on land. Be sure to ride your Gears on land, the Etones will crush you if you don't.

   At the Ethos HQ, head north and speak with Billy. Follow him to the west and talk to him again. Go west some more, talk to Billy again, and go down the stairs into a high-tech-looking area. Go east and talk to Billy. Follow him into the infirmary, where Elly will leave you briefly. Go back out of the high-tech area and head east. The next door on your south leads to the library; go in here and talk to everyone. Leave the library and Elly should come back (if not, look around the rest of the church and talk to more people). Return to the infirmary for more dialogue, then it's back to the Yggdrasil.