The Tatsuya Library was something not even the elders of their Clan could freely enter. Only Ryu and a select few others could since he was the son of their Patriarch and the grandson of their Saint.
This was to say that knowledge was very important to those of the martial world, so much so that it surprised Ryu that it was so easy to enter the libraries of the Radiant Star Sect, and even more surprising that no one was taking advantage of it.
However, Ryu wasn't one to bother with the stupidity of others and the matter related to him killing a disciple had already been forgotten by him.
After learning how the books were organized, he quickly found several books on the topic of soul and soul talents. When he opened the first, he was surprised to find that he actually didn't know as much as he thought he did. Or, rather, Sacrum was far more in the dark than he believed. It seemed that there were some talents that simply didn't appear in Sacrum at all.