The Dark Souls lore is centered around the cycle of the First Flame. It's about the struggle between light and dark. The undead are key as they are linked to the fading of the Flame. There are places like the Undead Asylum where your journey begins. It shows the desolation and the harsh reality of being undead.
Perhaps a story where Dark Sonic is being chased by some dark forces and he hides in Rainbow Dash's cloud home. Rainbow Dash discovers him and at first is scared but then decides to help him. Together, they fight off the dark forces, with Rainbow Dash teaching Dark Sonic about friendship and loyalty along the way.
It's a bit of a gray area. The base lore of Dark Souls is not fanfiction as it's the foundation laid by the developers. However, the way fans expand on it, fill in the gaps, and create their own interpretations can be seen as fanfiction - like. For instance, the nature of the Abyss in Dark Souls has some official details, but fans have created elaborate theories about its origin and how it relates to other elements in the game, which is like fanfiction built on the existing lore.
The lore of Dark Souls has a lot to do with the cycle of fire and dark. The First Flame is central. When it was discovered, it changed the world. Souls were born from it. There are different regions in the game, each with its own backstory related to this overarching theme. For example, Lordran has a history tied to Gwyn and his actions.
One alternative topic could be the dark elf's unique weaponry. For example, their use of poisoned daggers or enchanted bows. These weapons are often crafted with great skill and are an important part of their combat abilities.
Well, maybe because the lore in Dark Souls is often fragmented and open - ended. It lacks a traditional linear narrative structure that a typical story has. So it might not be considered a 'full - fledged' story in the common sense.
There's 'Rainbow Dash in the Abyss'. This fanfic could take Rainbow Dash on a journey into a dark and mysterious place. Maybe she gets lost in a strange, dark dimension where the rules are different and she has to use her wits and courage in new ways. It could show a side of her that we don't often see in the normal MLP stories.
The deviation from the normal, positive image of Rainbow Dash. It's like seeing a different side of a familiar character. It allows for more complex storytelling.