But one problem with calling Light and Darkness EON using your metaphorical reference,
how can we relate moral/immoral values to animals? Animals and individual cells don´t necessarily have that kind of mentality, if anything, they only have a sense of what is bad or good for them in terms of survival instinct, such as the antelope knowing that the lion is dangerous and the lion knowing it needs food for survival.
How can we classify Light and Darkness as EON according to your metaphorical interpretation of it, when this kind of knowledge only applies to humans? is that really enough to classify them as EON?
Light: Altruism, desire to unconditionally help others with no benefits to yourself.
Darkness: Selfishness, desire to help yourself at the expense of others.
Animals are perfectly capable of such acts. Selfishness is survival instinct, while altruism can be shown when animals protect their offsprings. I never said these elements are "moral"; in fact, I classified them as Spiritual.
Light and Darkness are metaphorical, but their physical manifestations resemble normal light and absence of light.
Honestly, first time I knew Elements the Game, I was disappointed. I don't know why time, gravity, aether, entropy, life, and death are categorized as nature elements.
Even since I was a child, I have decided what the standard elements are, or at least in my ideal. Those are:
Fire
Water
Air
Thunder
Rock ("Colorless" human-type creatures belong to this)
Wood ("Colorless" animal-type creatures belong to this)
Metal
Light
Darkness
There are nine. And I've never seen any story or games which use exactly those 9 elements. The only one approaches that was Digimon Frontier, with an addition of Ice. But I always think that Ice element is included in Water element. And if there's Ice element, why there's no lava element?
Still, I never consider time, gravity, and etc who are abstract to be any element.
Several years ago, in China, I used these exact 9 elements before. I got those by combining the Chinese 5-elements system (metal, wood, water, fire, earth) with the Japanese 5-elements system (fire, water, earth, wind, aether), along with Light and Darkness. However, I have long since ditched that system and looked for simpler ones. Currently I'm settling with the classical Greek elements (fire, water, earth, air), along with light, dark, and aether, and adding my own twists to each of them.