I think if an evocation is based on an inner understanding of what is being evoked, then the book used to define what is being evoked is the source of what is being evoked.

The deity you evoked has its roots not in some spiritual dimension but in your specific copy of its book.

This means I could evoke Turokium Phosphate if I have a clear vision of what that is.

If I write a book that defines Turokium Phosphate, then my copy is the source of that specific energy type.

If you have a copy of this book, then your copy is the source of the Turokium Phosphate that you can evoke throuh evocation.

This is the same for Viral Kinblade, Dragons Koretoretos, and Iron Faerie Monkstorm,

By my defining the Heavens as the platonic realm of the forms, I suppose you could say that Turokium Phosphate comes from a Spiritual Dimension, but then again, so does every other concept that is either data or information.

To get further into this topic, I need to study basic evocation before I attempt custom evocation.

If you evoked Athena or Aphrodite, you didn't summon them from what they were doing as individuals.

If 16 people evoked Athena, there would be 16 Athenas, because the Athena is a thoughtform built in the imagination, programmed by a book.

The Heavens aren't a place or location, but a dimension of data.

The Zeitgeist of Earth is the collective human understanding in the present, whereas the Zeitgeist of the Heavens includes things like calculus, which was discovered just like fire.

If you bake a muffin, that is your muffin that you made from a recipe. It wasn't summoned from the magical muffin world.

If you worship God, you formed God in your Imagination into something that deserves worship.

Just because its a construct, doesn't make it not real.

The God you are praying to is real because you formed him that way, as you understand him to be.

The Power of the Imagination is Infinite, and that makes a Human Being into a Universe-Level Beast.