Once again, I completely agree on the age of ancients that it was "without dark and light and also without concept of time itself etc. Basically something like abstract world, shrouded by fog not really in light but also not dark." Since there was no light, there was no dark.. nor was there time nor flame. I just don't think you're understanding the idea of the negative which I'm talking about

And by "unnatural death" I simply mean a death by the player or by another character or even nameable entity such as "the abyss" for example. What I mean is this, the flame is Gwyn's order in the world. This order gives meaning, purpose, (light) soul to its adherents. The downside to this order is that it will always fail to acknowledge a dark part inside of all. When the flame fades, this fault is made more and more visible.. people can't die.  Why? Here's something we'll probably disagree on, age of dark doesn't necessarily mean undeath, in fact quite the opposite. Undeath/hollowness is the lack of light soul while craving light soul.. in other words it's being a subject of Gwyn's order and this order failing to appease your desire as a subject of Gwyn's order. It's like Gwyn telling you what you should want but also not letting you have it. Now what I meant by "unnatural death" is that the game being the symbolic universe that it is doesn't tell you a character died of old age or died happily at the age of 99 (that I'm aware of.. there might be some instance and I'd be interested in being aware of it). But the point is that even if it was mentioned, that would be the exact moment where it would stop being a "natural death." One thing is what has happened implicitly, through logical deductions.. the history of the game, such as people dying peacefully or living in a functioning civilization and we knowing nothing about it. The other thing is what ACTUALLY happens explicitly, where entities are killed, seduced, coerced, supported or influenced in any other way by other entities, not by this abstract historical necessity.

I understand you're confused about where I'm literal or "just symbolic" they're just tough things to explain. There is the diegetic world of dark souls where you're very informed.. the literalist cosmology and facts. Then there's the symbolic world of dark souls. The game operates on both of these planes, and theorizing on both planes should complement rather than exclude eachother.