I was going through the focus AAs and noticed something about Improved Demand for Power. It applies Helix of the Undying II, and one of the benefits is that it increases the chance to dual wield by 12%. Since when has a Shadow Knight ever been able to dual wield? Maybe they can replace that with something that would be better suited to us.
You want to max this focus. Helix is extremely handy with the general debuff and slow, not to mention, at a certain rank protest becomes instant cast. And, if you use a DPS rogue merc it would help in that regard.