White Sentinel? Not sure, but, Isnt he the one who gave the bone to command the lesser skellies? Of course it wont work on him. However.. I dont remember that being what he is called. I almost think you are using the bone scepter on the wrong quest.
Power level to CP160 in a week:
Where is the end game? You just played it.
Why don't I have 300+ skill points? Because you skipped content along the way.
Where is new content? Sigh.