From Blood and Ashes
Arcanum Altum Imperii
(lit. Imperial High Magic) A Drawn Magical system devised during the rise of the Eustanni Empire to codify and organize Magical Principles. It was a rational and practical philosophy with a strong focus on metaphysics. Imperial High Mages were renowned for their skill at transmutation and the altering of existing physical phenomena into practical applications.
It consisted of three basic concepts:
Forma: The Idea of a Thing.
Synthesis: The Composite characteristics of Real Things.
Corpus: The Universal Matter that suffuses all Things.
High Mages would first contemplate the desired Forma and then alter the Corpus into a new Synthesis. The closer in Synthesis the desired result was already to the existing Synthesis, the easier the Transmutation was to accomplish. Like to Like was almost always easier to accomplish than drastic changes.
Almost nothing of the Tradition has survived into the modern era except for the basic Metaphysical Philosophies which now define the Theology of the Church of Azer.