Trust
Writing a book with all the necessary information mankind required was difficult, even more so, if he had to make everything sound reasonable.
Jason knew that the humans didn't trust other races except for the Ariyor and Elvyr race anymore, and it was even difficult for the big clans to maintain peaceful relations with each other.
There were many conflicts that had occurred, but everyone was forced to remain calm because they wanted to obtain the completed version of the translated manual they had received from different foreign races.
Reading the information on the first few pages and putting it into practice had already increased their combat prowess by a large margin, and Jason, who hadn't seen any human during the last seven months, was still able to accurately predict the events unfolding on Canir, despite being tens of thousand miles away from the continent.