Hello everyone, how long did you play the current Black Kat event and how many Black Kats did you kill to find a Book of Dark Rituals? Also, do we need to play on elite to have a better chance of finding a Book drop or is Normal difficulty fine?
Looking at the current player statistics, I believe less than 5% of players even found a Book. I see no one is selling the Margrel slots. This alone tells me that no one has found the Book until now.
Maybe you found one and how many did you kill to get the Book?
Let me know if you think the event is broken regarding the odds.
To answer your first question, I found my first Book after only a few black kats, during the first Kataclysmic Konfrontation. This experience seems to be far from typical.
There have been many threads over the years, in which players express their frustration at the low odds of finding the Books (and hence some of the most powerful gear in the game). It makes everything too dependent on luck.
There have also been threads where players gather data needed to estimate the Book drop rates. The data sets need to be pretty big to constrain the Book drop rate, because the chances are so low.
If you want to find some of these threads, search Google for something like "black kat book chances site:forums.spiralknights.com" (without the quotation marks).
I have not seen any recent large-scale studies of Book drop rates, so I don't have any reason to believe that the drop rates have changed.