Fans of Mass Effect who have been waiting for the conclusion of the Quarian ark storyline in Andromeda, we have a good news/bad news situation for you. The good news is that we'll finally find out what happened aboard the ark, called the Keelah Si'yah, and get some closure for that storyline. The bad news is that it's happening in novel form, rather than as a playable DLC. The plot point will be resolved in the book Mass Effect: Annihilation, which will be written by sci-fi author Catherynne M. Valente. It releases in the US, UK and Canada on June 26, 2018, and in Australia on August 28, 2018.