What is the definition of Ebony Fluid?

An 'ebony fluid' is basically the secret ingredient in the universe that makes things darker and more mysterious. Picture this: "The ebony fluid of the unknown lurked in my mind like a shadow, waiting to unleash its ominous secrets upon you."

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Now, here's an edgy sentence: "The ebony fluid of existential dread seeped into my bones, leaving me questioning whether I should've taken that job offer or if it was just a dark conspiracy to make my soul sink."