Finished stories for endless games

How do you write the story of a game that could be replayed forever? How do you build a game narrative that can hold multiple playthroughs and updates? How do you plan your stories and characters ahead?
These questions have been on my mind since I started working on roguelike games such as ASTRAL ASCENT and WINDBLOWN. A story is about change, about movement. But some games cannot afford changing too much.
In this talk, we will explore how to set up your world, your characters and the your story to support a "forever game". We will discuss about how lore is important, but also a very dangerous zone where a lot of writers and designers end up wasting time and energy. We will also explore the risks of using Hades as your benchmark and why narration is often not the best way to reward your players.
All this will come from personal experience as well as knowledge shared by the writing community. We want this talk to be quite accessible to everyone interesting by storytelling. The idea is to leave this talk with ideas, solutions, and a list of red flags you want to avoid as much as possible.