This is the secret weapon of The Empire... a floating fortress.
"Compared to this city, the skyship is like a small mosquito drifting across a large table just enough for twelve people to dine."
Ian whispered, "No information was leaked at all; the intelligence work of The Empire is indeed formidable..."
"Do not underestimate the research of the Spirit Wisdom Institute."
Marquis Barton stroked his mustache, leisurely saying, "To maintain secrecy, starting directly with the mind and soul is indeed a good approach. Since the Era of the Black King, The Empire has been quite advanced in this area."
"I couldn't even make vague hints until you saw it with your own eyes — I'm at the Third Energy Level; how could those engineers and technicians doing the specific work possibly disobey?"
"Moreover, they may not necessarily know what kind of marvel they are creating... After all, a special iron fortress, even if it's a mobile fortress, is not uncommon on this land."
