Unlimited Money in the City

How can you become stronger without spending money? Sorry, you don't need to give me more money for billions or tens of billions. What I want to earn is tens of trillions, hundreds of billions! Because what I want to buy is a stellar-level Iron Man Legion, a converter that can use the dark matter energy of the entire universe! "Our goal is to journey across the stars and the sea!" This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.