This is just my theory, at some point we are going to be contacted by one of the many "Gods" in the game, they are going to tell us that we are going to need to make the Godhammer Bomb again in order to kill Eothas. We've already created "God" weapons, such as Abydon's Hammer in White March Part 2 using The White Forge. The Godhammer Bomb was Magran's work which Durance was a follower of and he helped create it so did 11 other engineers, but Magran was working with Woedica to kill Eothas. So i believe that one of these "Gods" will contact you in some way to try to get you to create the Godhammer Bomb. Any other theories are welcome.