I'm going to do something that I don't normally do, which is to muse a little bit on the theories of other fans. Normally, when I write these lore posts, I write about what I believe - my own personal interpretation. In this case, however, I stumbled upon a video and a blog written by two different users that posit two entirely different (and probably contradictory) fan theories regarding the Souls games. Both theories piqued my interest and lead me down a rabbit hole of my own thought and speculation. So I'm going to summarize the theories that these two have pitched, and also throw in my own thoughts.
But first, let's review the conventional Dark Souls wisdom of the cycles of Fire and Dark. According to conventional wisdom, the dragons and archtrees of the Age of Ancients existed at the genesis of the world. The fire then appeared and ushered in the Age of Fire, but the fire faded, and the Age of Dark began. Lord Gwyn sacrificed himself to rekindle the flame and renew the Age of Fire, but it eventually faded again, leading to an Age of Dark. And the world continued in this endless cycle of the fire
fading and then being rekindled.
An overarching cycle of world-creation?
First, I'll start with a video by The Ashen Hollow, which is about the Cycle of Ages, and which speculates that the Soul of the Lords and Age of Dark ending establishes that the Age of Dark eventually gives way to yet another Age of Ancients. This creates a cycle of cycles, in which not only does the world of Dark Souls repeat Ages of Fire and Ages of Dark, but that once that cycle has run its course, it repeats yet another cycle of world-creation. Dark Souls III, therefore, takes place at the end of an Age of Fire, but it also takes place at the tail end of a cycle of world-creation and destruction. So Dark Souls III is a sequel to the first Dark Souls, and also the first Dark Souls is - in a sense - a sequel to Dark Souls III.
"Soul of the Lords.
One of the twisted souls, steeped in strength.
Use to acquire numerous souls, or transpose to extract it's true strength.
Since Lord Gwyn, the first Lord of Cinder, many exalted lords have linked the First Flame, and it is their very souls that have manifested themselves as defender of the flame."
When the fire inevitably fades, there will be an Age of Dark. This we know. The entire game series, so far, has been about perpetuating this Age of Fire for as long as possible in order to avoid the Age of Dark. Though the first and third game gives us the explicit option to initiate an Age of Dark, it's unclear if that ever actually happens in the canon of the series. And even if it does, the ending of Dark Souls II establishes that either course of action will just result in that chosen age cycling back to the other. We've never actually seen a proper Age of Dark, so we know little of what it would be like. Perhaps the Age of Dark is not permanent. According to the Fire Keeper (if given the Eyes of a Fire Keeper), the Age of Dark is not completely without fire, for there will be little embers dancing in the distance, left to us by past lords. [More]