This is my quick way to farm the black skeleton in the hidden passage of 4.2
Stats:
Vitality: 19, Intelligence: 14, Endurance: 13, Strength: 30, Dexterity: 72, Magic: 18, Faith: 20, Luck: 15
Soul form is necessary and Pure White World tendency doesn't hurt the damage output, but it does hurt the drops. Clever Rat's Ring and Ring of Avarice are important for added damage and soul count. Large Sword of Searching may or may not help with the drop rate on the Pure Bladestone since it's a 100% drop on the Skeleton.
Simply drop down and run around in circles to get the flying manta's attention and let him hit you which should almost kill you but not quite. Your CRR will activate so run on in and kill the reaper with hard arrows if you have them(I haven't talked to Patches yet in 2.2 so I can't get them right now). Drop down and pull out your LSoS. Run up and open the passage and switch to your bow again. Hit the skeleton with 4 arrows, roll back 4 times, hit him with 2, roll back once, then finish him off with the last arrow.
What used to take me 4-5 minutes to do now takes me 1 minute and 40 seconds.
The song is Tic Toc by Klea.
I don't own the rights to the song or the game, and they are copyrights of their respective owners.