And Fran Fort, the "defense against the Abyss" that Artorias currently exhibits and interests adventurers the most, is the main storyline he came up with after some thought.
Besides, in reality, the role of the "Demon Clan" in the Abyss is only a scapegoat.
When you think about it, everything related to the Abyss is fully integrated within "Dark Souls". Almost every scene in the game can be linked to the Abyss, and even if there isn't, it can be said that Fire Transmission is to resist the Abyss.
Now that I think about it, choosing to start from Fran Fort from the beginning was absolutely brilliant, and the additional maps to be added later are clear as day.
Fran Fort, Casas Underground Tomb, Cold Valley's Yilushier, Yanor Londo… they are completely interconnected scenes.
When it reaches Cold Valley, the main storyline can shift to Fire Transmission, and it can connect Dark Souls I and II.