Just have a thought: After the game end, in the Hypothesis where the door that lead to the new universe stay so they can come back to the session (I don't think that ever was confirmed?) If the player want to do alchemy, where do they find new grist? likely after the 'End' of the game ,Monster probably stop spawning or something (with the defeat of the Black king and Derse with it) Also, i wanted to Thanks you for taking time to answer all of the stuff people ask, you blog is really neat :D

The Denizens create the Underlings, so they could be commissioned to make more if any of them are still alive. Other than that though, it’s also likely the Grist Hoard gives an infinite surplus of Grist aside from being used for the Ultimate Alchemy.

And the door does stay there! Jack and co go through it in the Snapchats, long after the Kids have left into the New Universe.