Hawtrey murdered a ship full of children by cutting their beating hearts out of their chests in an effort to give the shards he's collected a doubly effective power boost. It's possible he's working with someone but I can't tell for sure. He will likely become a literal monster for this, the likes of which may have plunged this world into an era of scholastic darkness many years ago. I'd like to avoid that outcome, if possible.
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