It was a body tempering technique exclusively for knights. Not just that, it had high qualifications to master it and fortunately, Tiresh would be able to.
It wasn't a simple body tempering technique, it contained all the points needed in order to raise one's cultivation and whatnot, too. Not to mention, this book was one of the ancient books his master had left for him before he passed away. Remember, his late master was a universal law so his items must be precious and invaluable.
"I don't if I can accept this." Tiresh could see the high value of this book. Money couldn't buy it even if she tried to. In fact, once this was known to the world, many would fight fir this. After all, there were tons of knights here too.
"Accepted it. You have no choice either way." Jin Rou insisted, "It has no use for me since I'm not a knight. It's better for you to use it instead. It will make you an emperor if you successfully master it and perhaps, a heavenly too."