general rule-of-thumb for beasties is: most examples of (what we think of as) mundane beasts (beasts which live in large numbers) are indeed entirely mundane, with no powers and no vis in their bodies; of those beasts, a small fraction are special "beasts of virtue", or such: they have a Might score, supernatural powers, and leave vis behind. As another rule-of-thumb, 1 pawn of vis per 5 Might is about the norm...
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