What is the definition of Hardcore Blood Cells?

"Hardcore blood cells are the superheroes of the bloodstream, always on the front lines battling infection and disease with sheer, unyielding force. Imagine this: 'The hardcore blood cells marched into the battle against the invading zombies, their RBCs screaming 'I'm not letting you take my oxygen!' with every single one of them.'"

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Now, for an edgy example sentence: "When the virus decided to stage a surprise blood cell invasion, the hardcore red cells turned up their game, pumping out more than their fair share of 'I'm not giving up!' juice."