Home to the Original Seven, the Grand Hall is one of the most treasured buildings on the Omega Star. At the center is a massive banquet hall where the Seven hold formal galas and informal parties alike. Underground is a coliseum where captured monsters are pitted against any heroes wishing to hone their combat skills. Arranged along the outside of the semicircular complex are the individual residences for the Original Seven, acting more like small apartments than ordinary bedrooms.