Things that no one had seriously considered doing, even during the Death Eater years, were now researched openly by the terrorist groups. Most destructively, they had figured out how to dramatically enlarge the explosion of an Erumpent horn with potion ingredients. Only last week, someone had detonated such a magical bomb in Diagon Alley, destroying half the stores—including Weasley’s Wizarding Wheezes—and killing dozens. Mrs. Weasley and George were killed outright in the blast, and Ron was still in St. Mungo’s with severe head trauma. The immediate injury was healed, but he was probably going to be in the long-term resident ward. Hermione had never thought much about it, because wizards’ skulls were so much tougher, but if a wizard did receive a bad head injury, there was no quick-and-easy spell to reverse the psychological results of brain damage.