Before this thread get hijacked by the usual suspects.
Let me repeat, again…anyone on THIS forum, thinking they know about the “dark” path IS. FULL. OF. SHIT.
Don’t confuse out of control Ego-ism with the “dark path”.
The Dark path involves even MORE self-discipline of the Ego than the light path.
All already said above, but needs to be repeated for some reason. 
That is all.
Very close.
One has to reverse polarities from the service to self path in order to progress any further and transcend to the non-dual - which is apparently very hard for high level Service-to-Self beings.
Very rare. But it’s been done.
Yes, but without the “Rule of Two”. 