The basic jist is that I like to catalogue my kills in games and I know I am not alone in that.
It'd function sorta akin to FF12's hunt system where you could pick up jobs to go slay rare beasts but in this case it would just be filling out a compendium of information on creatures in game and killing X number of them would contribute to filling out the drop infomation etc etc.
I've not been playing this game long but have noticed there is nothing like this in the game and I'd adore seeing it someday.