Role-Playing My Fourth Doppelgänger

There Are No Good Books on Steel Gate. Why Is There No One on Steel of the Heart?

I want to read a book like "Gaowu: The Steel of the Heart at the Beginning, Numerical Values ​​Can Crush Everything". There are no good books about Steel Door. I have rummaged through Tomato. Is there no book about the pure numerical value of Heart Steel? It can be slightly weakened, but don't come with magic modifications.