After 'Where It All Began', you will find yourself in front of your family home. Interact with the front door to proceed with the quest. The nature of the epilogue will depend on the choices that you have made throughout the game. If you chose vengeance over forgiveness, you will only be having dinner with your mother, Myrrine. If you chose to spare the life of those closest to you, your sibling, Nikolaos and Stentor will be joining you for dinner.
Note: An outcome with your full family reunited provides you with the added benefit of having them as companions on the Adrestia. Equip them all before you visit the Adrestia to experience some amusing dialogue between them. You will also find that they will continue to comment on aspects of the world as you travel through it.
When you are done with the Epilogue, a new world quest will be open to you. You can meet Sokrates at the Cemetary of Athens to begin it. There is nothing that will pose a challenge during this quest; consider it as a kind of treatment of post traumatic stress disorder for all that you have endured in the story.