Tarmor's Terribly Tantalizing Tarasque Terrrifying Random Banter #234

[Metastachydium]

Glibness aside, there's no meaningful difference between fatal injuries and non-fatal ones but size and location.

No meaningful difference between an infection that kills you and an infection that doesn't.

etc etc.

Immunity to fatal injures would, by all reason, make you immune to all injuries. Or rather, require it as any injury can be fatal in the right circumstances.

Likewise the same with infections: An immune system that can destroy HIV, Sars, Ebola, and Bubonic Plague all at once within seconds of them entering your body will absolutely destroy the common cold.

And if your celsl no longer requires food, water, or oxygen from outside sources to survive, then there's no reason tall for you to ever feel hungry or thirsty. You'd only need to breathe to talk, so there's be no issue with suffocation either. Oxygen deprevation woud't even make you lightheaded.

Again, a fatal injury is an injury that kills you. If it doesn't kill you, it's not fatal.
Likewise, the immune system of an immortal doesn't have to destroy SARS or Ebola or bubonic plague for this person to be immortal. If they suffer copious amounts of pain, exhibit symptoms but don't die at the end that's essentially the same result, just less pleasant.
Mutatis mutandis, the same applies to everything you said.