.hack 4: Quarantine
View the email from Bandai after beating the game to see where to find the Mummy Ship. Travel there and you can fight another Boss. Data Drain the Boss to obtain a rare weapon for Kite.
Check the BBS to find the final Goblin location. Travel there to fight and defeat the Goblin. Wear all the other Goblin items and you will be able to summon a Yellow Goblin in battle.
Thanks to Revolution reader otaku!