You can change events of Immortal Fenyx Rising!campaigns and see the outcome and how it changes the world. You can start with a question "What if". What point of the story of would you like to change? You can be Fenyx or replace him or her (since Fenyx is canon female but can change into male in the game): Main Game and all DLCs.

You are Fenyx, or any character that joins Fenyx, or you replace her (or him, since Fenyx can be male in main game, but canonically Fenyx's a she).

As you can start at beginning of the game at Apollo's Island and Temple....