I think that the Forge of Gods DLC will be about how we kick Cabals fhat asses out of Freehold and discover that the reason Freehold collasped was because of Mars actually being a huge vex factory, which the Cabal discovered and tried to shoehorn their phat asses in by developing mutated versions of themselves. Giant Phalanxes, Centurions that rapidly fired tracking rockets, Gigantic guardians etc.