I've been thinking about what we know about Merlin and Demonreach, based on a Reddit thread from a few days ago. One of the questions I have about it that's been bugging me lately is:
How did all of those entities (things, creatures, monsters, demigods, whatever) get imprisoned there? Was there some other kind of prison complex that Merlin took over? Did the Senior Council and Various Allies endeavor to capture the worst of the worst and hold them? Did Merlin personally capture all of those things? Did the previous Wardens seek out new inmates as part of their job? Was there some kind of ritual that trapped them all there simultaneously?
Being a prison built across time, I have zero clue how to really think about it. Were the prisoners, from our perspective, always there? Was there ever an observable (by humans, meaning the past... five thousand years, call it) time when Demonreach wasn't built, or wasn't full of evil things, or both? In fact, did Merlin deliberately drag entities across time to imprison them at some point in the past or their future? Is it possible that Merlin (or another Warden, or whoever) actually imprisoned things that haven't even been born/created yet from Dresden's perspective?
Demonreach has a whole lot of mystery to it, but this is the stuff I want to know the most right now.