Maybe I asked in the wrong section? =) If there's already similar information (like a video) somewhere else, please provide a link. Or maybe the forum is just inactive, or demonology is simply not a popular topic =))
PS It's almost May now, and I asked in February =(
In general, demonology is effective on maps where long periods without encounters are possible and there are resources. Also, you need to know how to properly use your creatures.