Zahaqiel/NatureofOblivion
The Nature of Oblivion
The standard textbook description of Oblivion is that it's black (and many people liken it to a black hole understandably), I prefer to describe it as white in contrast to the black of Pure Chaos in the Wyld.
My argument is this: The Wyld is endless chaos, continuously bringing forth new things. In Pure Chaos you cannot see because of all the formless potential. It is like a blackness that surrounds and enfolds you, until after a while you even begin to lose track of where your own edges are. And you never can be sure that there isn't something right beside you.
Oblivion however, is the end. You know that there's going to be nothing beside you inside it, because there is nothing there at all. It is empty and endless but has no measure of depth or dimension. If you've ever had your entire vision filled with pure white (even just if it was a lit white wall), you'll probably have noticed that it creates the illusion of being an endless field of white - that it has unlimited depth. Walk into that endless field of white however...
Oblivion offers clarity and finality while the Wyld offers uncertainty and potential. White seems much more to characterise the traits of Oblivion, while black characterises the traits of the Wyld.
So within this campaign description, Oblivion is white and the Wyld is black. It's a personal foible, feel free to ignore it or use it at your whim. I still colour Oblivion-aspected Essence as black, as it's entropy in action rather than the conceptual end of everything.
Also as a final point, it always looks much cooler when a black-clad Abyssal steps out of what was until that time a pure white, almost glowing, pool.