This could be a randomly generated greater vault, or a one-level mini-quest.
It might be considered redundant with darkforge, but where Darkforge is an unwholesome vault I picture Godsforge as having a more primordial flavor--a relic of legendary days long before the Drakalor Chain got corrupted.

Monsters: muscular dwarves, cyclops, animated armors, iron golems, greater fire elementals, eternium golems; maybe lightning and fire vortexes if they won't nuke the natives.
Boss: Named eternium golem "Talos", running the forge eternally while waiting for the slain god to return... special ability: immune to phase dagger/penetration weapons!
Guaranteed items: anvil, Hammer of the Gods + one metal artifact weapon/armor/shield, or 2 metal artifact weapons/armors/shields if the Hammer has already been generated.
Forges present, of course, and probably lots of ore or ingots lying around. It would be a good place to smith, if it weren't so deep in the CoC and therefore highly corrupting--even more so than DarkForge. Maybe after the gate is closed... :-)

Secret behavior/opportunity/quest for weaponsmiths? Maybe Talos knows how to remove essence of chaos and corruption from the darkforge artifacts, or will trade something special for them?

I love iron golems and eternium golems!

EDIT: By the way, I don't expect this to be implemented with all its details; I'm just tossing ideas out to give some idea of the flavor I have in mind. Much better if Thomas surprises us, if he likes the idea.