Angels are undying creatures and their destruction is temporary.
Angels are fragments of God.
Angels were created before the universe or existence was created. Anything that wasn’t God didn't exist. The Angels helped God create everything, all concepts and reality, including Heaven. Which is incalculable compared to the infinite amount of realities and universes, even higher dimensions.
There are an infinite number of Heavens and Hells.
The Void is made from simple nothingness and is not an absolute negation of existence.
Before time there was only God and the Void.
The emissaries molded the Abyss into a new form and erected a barrier between God and the Void.
Mages can interact with Tellurian space, push the boundaries of reality, move realms, make their own realms, and alter positions of various locations in the Umbra.
Mages can alter the forces that affect the whole Tellurian, can change how a universal force functions or invent new forces.
Mages can access all minds, they see the reflection of every thought in the Quintessential flow of the Tellurian. They can exist in the flow of the universal mind.
Atlantis may have existed in several meta-physical dimensions.
There is speculations that the Old World of Darkness is quite similar to Digimon. That everything is just information and data.