How do you think Necessarius would go about combating the Death Eater threat?
Lets say the timeline is just at [Order of the Phoenix] and before World War III (Ignoring the obvious discrepancies) so tensions are building on all sides. Necessarius doesn't want the Death Eater problem to be left completely unchecked.
(Keep in mind this is not to completely foil them, just put a major dent in their operations)
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