First post! Saw an advertisement for the game and immediately purchased it through Amazon. Looking forward to it's arrival!
The concept is actually one that has been difficult to accomplish in other games. The Shadowbourne is someone who can become a targets shadow. They are able to move with the target, across any surface easily(like a shadow) at the speed of the target (Shadow +Bourne: Carried). That would be the most basic application of that ability.
As it grows, the applications will expand exponentially...leading to such things as pulling others into the shadow and violently expelling them into collisions and impacts(Umbral Undertow)...sliding things into a shadow to hide them(Shadowfold)...slide rapidly from shadow to shadow, exchanging targets(Flickering and Switchshadows). One of the applications that was difficult to simulate was stealing the shadow of an attack and using against a foe. This, it seems, is an ability of the Mimic? Or at least looks like it is similar. That will make this easy to replicate(I called this Umbral Edge).
From the looks of things, this should be something I could create easily with Veil of the Void. Icing on the cake, Sci-Fantasy is my preferred genre by far.
Once I receive the book(2-3 days? Something like that), I will devour it's content and see how close I can make the Shadowbourne.