Money
"Mhm? So, this book is a kind of introductory book for Ardagan. There are only three main points in this book. The first is Ardagan is a living spirit and it chooses its owner by fate, not qualification. However, because of the pact between the ancestor and Ardagan, only those with Ardagan blood can become its owner.
"Secondly, according to this book, Ardagan has a few main features. I have experienced how highly interactive he is from all those system notifications. It's quite handy and powerful, considering Ardagan has the power to see a glimpse of the future like how he can suddenly give me a mission.