That depends. If there are just a lot of clefairy, I would advise calling in a professional poison- or steel-type specialist, just to discourage the colony from making contact with the miltank. If there are a lot of clefairy and strange lights in the sky at night, I would advise calling your local equivalent of the FBI. I’ve been told that they have agents who may or may not be interested in that sort of thing. Usually paired with agents who are decidedly not.