I was just interested in the whole concept this warm loving Mother has a very dark side when it comes to some of her children. She's kinda looking forward to that era of rampant growth Bob mentions in SK.
I've asked before, here again... If MW secretly cares for reality in her own way, doth not MS want to destroy it in her own way too?
Although Wormwood and it's connection to biblical apocalypse has been an interest of mine.
That is likely true; there's a yin and yang aspect to both of them.
As far as wormwood goes, I've made it something of a Biblical study of it myself. (For those wondering, Wormwood is mentioned in Revelations 8:11, as the Third Trumpet of the Apocalypse.) King James, Rev. 8:11:
And the name of the star is Wormwood: and the third part of the waters became wormwood; and many men died of the waters, because they were made bitter.
Wormwood is a star that falls from the heavens and lands on "a third of the rivers and on the springs." The reference to Wormwood immediately made me think of "stars and stones," and of meteor showers, and delivers a waterborne plague (think typhoid). One of the tropes I like about apocalyptic stories is when they find cool ways to incorporate Revelations as prophecies, but with fun symbolic interpretation. As a teenager, I even had it in my head that I was going to "break new ground and write a Revelations story with awesome interpretations of the Four Horsemen, with one of them being a biker and another driving a tank and—" you get the idea; I was young and didn't understand what "new ground" really was. I probably still have my notes on that terrible story somewhere. I should find them and read them to humble myself.
Anyway, I'm assuming that the BAT will include all apocalypses, because this is Jim Butcher we're talking about, so I'm figuring Wormwood's going to be a big thing that happens (or that Harry has to prevent from happening). Note that it says a third of the rivers and springs are tainted, not that a third of humanity is killed. That comes later, in Revelations 9, when four angels lead something that looks suspiciously like the Wild Hunt to kill a third of those remaining on earth.