posted August 18, 2014 06:39 AM
Hi!
I noticed some of your question didn't get much feedback, so I'd like to a least try to give you a hint. You make very complex questions, my friend. 
*On the other hand, I have to say that I'm not really experienced with trans-neptunians like Ixion, Sedna, Haumea, Orcus or Eris. Despite the fact I have Varuna over my Sun and I really like it and its name, even if some people says it means materialism or sort of.
And so far in LL, I'd say there isn't even a clear definition of Orcus. But even on the net, there's no much info you can find about it.
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*Well, if I'm not wrong Orcus in the myth is the other name of Pluto 'god of the underworld',the 'Grim Reaper'. The one who brings death to those who are not worthy or don't have anything else to do here. But behind this behavior there's also a "Justice concept", like bringing justice through Merciless Death.
And this is from lunarplanner.com.
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The Roman Orcus is said to be the god of oaths and the punisher of perjurers, apparently an extremist, being either terribly harsh or extremely gentle. I tend to take "punisher of perjurers" as referring to those who are not living or honoring their soul oaths--in essence living a lie.
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If what this brazilian Astrologer says is right, then I guess I'm doing it well even if I'm a first timer with orcus. In any case, this trans-neptunian must be studied more.
In synastry, many times asteroids work as 'complementary influences'. It's well known that many love asteroids like amor or valentine even well aspected, couldn't take away a high-tension aspect like a Saturn square Venus/Moon orb 0º.
First of all, in the majority of cases a person feels the influence of her/his NN after the 21 years. It will highly depend on the environment 'factors' seen in the natal.
So, in synastry:
When someone's orcus conjuncts the other person NN.
I'd say that the Orcus person will take 'the call of life' of the NN person as if it were his/her own battle.
And this person would do everything to help the NN person to reach that goal, even putting some karma upon him/her by removing "undesirable obstacles" from the way.
Because the nature of Pluto/Orcus is the act of removing impurities.
(That's why Pluto rules our large intestine and colon).
- Could it be rigth?
(I'd like to receive some feedback too)
I hope this helps.

P.S. Since this belongs to synastry, I think you're gonna get moved my friend.
[Edit] Oh thanks!
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~Il n'est rien de réel que le rêve et l'amour~