Marvel reprinted the recommended issues leading to the event in the True Believers: Empyre line. They also released a free magazine teasing the event.
The publication of this event was intented to span from April to August 2020. However, due to the COVID-19 pandemic, Diamond Comic Distributors suspended the distribution of new print titles between April 1st and May 27th,[2] which also caused digital releases by Marvel Entertainment to be postponed.[3] In addition to the resolicitation of the postponed issues to further dates, pushing the event's end to September, certain tie-ins, namely Empyre: Ghost Rider #1, Empyre: Invasion of Wakanda #1–3, Empyre: Spider-Man #1–3, Empyre: Squadron Supreme #1–2, Empyre: Stormranger #1–3, Empyre: Thor #1–3 and Strikeforce #10 were canceled, although there was no official statement.[4] The Union limited series was eventually expanded from three to five issues and resolicited as part of another event, King in Black.[5]