Heartland is an eight-level partial conversion developed exclusively for the Eternity Engine, created by Paul DeBruyne (skillsaw). It was first released on the Doomworld forums March 4, 2021, with the final release being uploaded to the idgames archive on March 25, 2021. The WAD makes extensive use of EDF in order to provide an enhanced roster of enemies and weapons. The new monsters are adapted from the Realm 667 “Beastiary”, while coding for the new overhaul weapons was provided by Xaser. Heartland also includes several smaller changes such as smooth animations, new weapon sounds, rocket trails, and blood effects. It uses the OTEX texture pack and features a custom soundtrack composed by Stuart Rynn (stewboy).

Heartland was awarded one of the 2021 Cacowards.