So, what power and/or concept you rather be the embodiment of it? And also be the deity of it and have absolute control over it.

Any power/concept is allowed, except Omnipotence and Metapotence. And it is only one power or concept, and please, a SPECIFIC one, don't choose umbrella concepts, like Reality, Cosmic, Totality/Omniverse, Conceptual, Power, etc.

But you can choose powers/concepts like Time, Magic, Space, Science, Mathematics, etc.

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Please, choose different embodiments from each other. So before you post your embodiment, read the replies to see if someone already choosed it, there can't be two Magic Embodiments, Time Embodiments, and so on.