Rare Items/Drop Rates;
Additional testing needs to be applied to this area but from the research I've done so far that crazy stat Luck does make a difference. There are items from past games hidden within this one. You'll normally see an enemy using it, or an enemy you know use to use it but isn't currently using it, does have the possibility to drop rare weapons/gear.
The only example I currently have of this is a player obtained the Black Knight Ultra Greatsword (dark black original from DS1) including the armor that the knights wore in Dark Souls 1 & 2. Points to luck were added (only to 20 though) but was using other items that would generate more frequent drop rates. After several hours of farming he was able to obtain the item's he wanted and even though game has only been out for less than month, he is currently only player sporting this weapon & gear set. I've seen some other examples of this but I'm not famaliar enough with the weapons to be able too name them. The players I see with these weapons are (kinda freaks, sporting 350-450hours played thus far) only high levels, 250+ that farm area's for ten's of hours if not days of farming.
I'll get back to this post, as I know it's lacking any real solid evidence so far, but I wanted to get it out there that there IS secret items and gear waiting to be found. Noothing that's marked or anything. The person had started farming it purely out of curiousity but after achieving a couple pieces of gear he was unable to find in armor index he pursued and achieved his goal to get a completely super rare set up of armor and weapon.
I'll be starting my expirementing on farming specific enemies throughout the week, anyone willing to join in on the research feel free to join me and hopefully discover secret's we can share with everyone.
(This seems like it belongs in DS2? Need a second opinion.)