The Thirtieth Floor of the Tower. It's Middle Area is the location of one of The Workshop Headquarters. Every 5 years an item tournament is held for E-rank Regulars, known as the Workshop Battle, with exclusive items made by the Workshop as prizes.
One of the Workshop's headquarters and the great suspendship Archimedes are located on this Floor, which departs from Sepia Island. Sepia Island is regarded as one of the most beautiful places in the 30th Floor Middle Area. Sepia Island was the scenario of one of the Workshop Battle's event: One Shot, One Opportunity. It's implied that most of the Floor's income comes from tourism, because its coast areas are filled with a great variety of hotels which Regulars can choose to stay in.
- Main Article: Part 2 - The Workshop Battle