What Are Eras?

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Eras, the weirdest concept I've heard in these last hours. I mean, I know what Eras are, in the common term, but all of this happening feels way too crazy. How can just me existing as a supreme influence the world is such a way?

"Well, when you became a Supreme Goddess your very being became part of the world. Your soul and your divinity, due to this, you have to imagine the world as a giant divine realm, the more you infuse an element into it, the more it will develop that element on its surroundings." Said the Supreme Goddess of Life and Origin.