Thread:Daifukkatsu/@comment-24390268-20140117062128/@comment-6003396-20140210071946

I believe all of the drop rates are sourced from the official strategy guide. They are rated as follows:

M - Guaranteed

E - Common

D - Semi Common

C - Semi Rare

B - Quite Rare

A - Rare

S - Very Rare

I've checked the scans I have of the guide, and, strangely enough, it says that Twinkling Titanite is a guaranteed drop (M) from the Giant Clams in the Crystal Cave, while it is quite rare (B) within The Great Hollow. The guaranteed drop is obviously false, though, and the drop rates on the enemy page here on the wiki correspond to what is stated within the guide: Purging Stone (C) and Twinkling Titanite (B) within Ash Lake. The guide's continual use of the word "rare" throughout most of the drop rates is not ideal and a bit misleading, though.