User blog comment:BannedLagiacrus/Monster Hunter Ecological and Lore Info Blog/@comment-6050823-20150926000412/@comment-26421638-20150926141524

"In Monster Hunter 4 Ultimate, these documents were used to discover some new species or some special monsters."

So... I think is referred to the codex that we obtain in g rank... But this means... The Ancient already know the existance of monsters like Raging Brachidios and Shah Dalamadur by a very long time? That's impressive...