i died more because of black skeles than of any boss/enemy in the game. with my first toon (a dex build) i farmed myself a pure bladestone in ng. i died so often from the BP black skele and the hidden passage black skele. they can oneshot you if you have PBWT. so i was very affraid, constantly rolling arround and harrassing them until they died. that was a major mistake.
its insanely easy to beat them. and the fact that i figured it out so long after they killed me so many times is a bit embarassing. nontheless i want to share my method with you because if anyone outhere is farming for bladestones then he simply MUST know this! ok heres the thing:
1. equip a 1handed weapon that potentialy does piercing damage. on a dex build use any fatal weapon, or the uchi for example.
2. equip a highly upgraded knights shield or a fully upgraded dss.
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3. get the attention of the black skele. he will do the sweeping attack first (i cant remember that he did anything else as a first move)
4. roll through the sweeping attack. for me its the easyest without lock and a sideway roll. you can use lock on if you want.
5. backstab
6. on wakeup you can poke/harrass him with 1 attack until he tryes to hit you with a standard attack or a hyper armor attack
7. parry
8. riposte
9. loot
gl on getting pures!