The two are working to find a timeline that doesn't end in some kind of disaster, while Basim escapes Yggdrasil with the aid of the Staff of Hermes, re-emerging in the modern-day storyline.
These elements, along with Basim's reincarnation, tee up Assassin's Creed Shadows' modern-day narrative. Assassin's Creed Invictus aims for a multiplayer experience, and it could learn something ...