This is one of the best originals I've seen on this site and everyone should try to read it.
That being said there are two major faults with worldbuilding I'd like to point out. This shouldn't stop anyone from trying it, though.
First, the money. This new world works like a tribal society. There's no agreement between tribes or races to enforce the usage of gold and silver as currency. No one trusts one another, humans and non-humans. There's no reason for gold and silver to be accepted as currency to the whole world. At best it could maybe be traded by weight in gold, but even that is fickle. People need survivability, not precious metals from Earth that should have no value there.
The worst is that the author had the perfect plot device to avoid using gold: Essence. If people could exchange Essence between them, there is no reason for gold and it's pretty clear that, plot wise, essence is meaningful for everyone, no matter the race, and universally acceptable.
Second: Manuals. The world has a system where characters can level up stats or get skill from monsters they kill, using 'Essence'. Yet, the author added books that the MC would find and learn techniques, Wuxia-style.
That really didn't go well with his system plot. It would be far better for them to be regular skills from the system.
Like the dagger technique he got by killing a bandit, for example, instead of a book the character should have a chance to gain the skill of the target, monster or human, this way he would have only the skills the Author wants him to have in the end.
Like I said, overall this is a very good novel, but these two points stuck like a sore thumb for me. I'd even advise the author to rewrite them. It'd be a pain, but worth the hassle.
