Natural Energy is the term for the fundamental flow of energy present in the Multiversal Engine Fabula Nova Crystallis and it can take many forms. Though the majority of individuals are not aware of this energy and cannot even sense it, a few unique individuals having undergone focused training can learn to sense and even harness this flow of energy to empower themselves.

These individuals are generally referred to as "Sages" - being able to enter into a unique transformation called "Sage Mode" - and once they have gathered Natural Energy they can combine it with their internal Ki (Physical Energy) and Reiryoku (Spiritual Energy) in order to create Sage Chakra. Techniques utilizing Sage Chakra as opposed to conventional Chakra are often greater in scale and destructive capability.

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