The magical magic creature of the day is...
Bundimun
MOM Classification: XXX
Bundimuns are pests that look like a pile of fungus with eyes, but that infest houses and rot them away from the inside out. They are controlled by Scouring Charms (gee, I wonder how those poor Muggles who come across one will handle it, eh? Do those ever-so-noble Wizards just leave their house to collapse or do they fix the problem and mind-rape them? Which is worse?).
Incidentally, the way that these little creatures rot those houses is through a secretion which, when diluted, is used in magical cleaning fluid.

Bundimun
MOM Classification: XXX
Bundimuns are pests that look like a pile of fungus with eyes, but that infest houses and rot them away from the inside out. They are controlled by Scouring Charms (gee, I wonder how those poor Muggles who come across one will handle it, eh? Do those ever-so-noble Wizards just leave their house to collapse or do they fix the problem and mind-rape them? Which is worse?).
Incidentally, the way that these little creatures rot those houses is through a secretion which, when diluted, is used in magical cleaning fluid.