Soul wars bot would be alright I guess, or get a bone burying bot (kind of a waste of money these days, better off getting the huge exp boost from gilded altars).
if you have the money just use d bones on a gilded alter. Shouldnt take long at all. Maybe 2 hours maximum
If you dont have money i guess you could do sw
If you're not poor, or willing to spend the money, I definantally would suggest just getting it by buying dbones and G altering. its quick, i did it not to long ago, gl!