Board Thread:General Discussion/@comment-16399478-20130627034816/@comment-7153552-20130909135839

Nait Nelthar wrote: You have to be a werewolf yourself in order to get the purity quest... Also you can get the quest by talking to them in jorrvaskr.

I tend to get the quest after finsihing 1 extra quest from vilkas and farkas. I think the issue wasn't that OP - or other's posting - needed to know the regular way to go about it, it appears we were dealing with a bug. But it would appear we found a possible point of origin for said bug in that it started after Contrib 88.97 left the Tomb.