Fury may be old and crusty, but he's still got some pretty neat powers. Ancients had the ability to change their size and alter their appearance slightly. Fury mainly changes his size to fit through the corridors in his palace and get a better view of his garden's inhabitants. He is blind so he uses his hearing, but that is also going bad. So having the ability to change his size to get close to objects or animals is really beneficial for him.
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