[quote=@Meta]
<Snipped quote by ZAVAZggg>

I apologize for my ignorance, Lord Ainz. What is this "pure ingenuity?"
[/quote]

Knowledge, Shalltear. The humans here have built all of this without the aid of magic or magical artifacts. To put it even more simply, they used logic for once. It is quite an accomplishment considering their history of warfare and infighting.