It has been many years since I wrote it, but my best guess is that I was saying that the maleficium could drain Strength from people, animals, or plants, which adds two magnitudes to the level. I only had enough words for two maleficia for each combination, so I felt like there should be one example of that. Adding 2 to the maximum score available through this effect seems to me a much better use of the extra magnitudes, though!