Empaths
No matter how much Ash studied the book, there were some areas which had been left too vague or had not been updated.
It was common for old books to have many parts where the current generation would be unable to understand them.
There would be some areas where their understanding of such techniques and explanation had not been developed completely to allow a clear and concise explanation.
Compared to back when it must have been written, many people had already contributed towards many different fields of study allowing for many advancements that opened up new approaches and provided explanations for many subjects that were difficult to understand in the past.
The only available option left was to search online where so much information was left available to the eyes of everyone.
The first area she began to search up was superpower based comics and other media.