The Golem Crafter

It's all just politics.20% in still no kingdom building in sight

Rip I also really want the rest of the chapters but I don't wanna read mtl T~T

Manchu glanced at her but said nothing. The old physician turned toward her and was slightly startled by the young boy's delicate appearance, but regained his composure and began explaining.

That pretty much sums up the lack in development of vehicles. Also, the air current in high attitudes in this world is extreme. Resulting in the first angel death in experimental failure.