SPOILERS AHEAD
I can speak to Durance about him helping creating the godhammer, and I do this anywhere, i my case, while in town, i just initiate a conversation and speak to him about multiple things and thats one of the things he say.
After hours later, I go to sleep, and I wake up to a vision of him holding the staff and light eminating from it, and after speaking with him about it he "reveal" to me he helped shape the godhammer.
And my response is - "You helped build the Godahmmer?"
Which I already know he did ... maybe its a bug that I shouldn't be able to speak to him about it before I get this scene.