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The Red Fruit is an object in Shadow the Hedgehog. They are alien fruits that the Black Arms plant during their conquest of Earth.
Crimson, stationary, spiky plant-like objects that serve to punish hedgehogs who zip around recklessly. Red Fruits tend to be found wherever there are Black Arms afoot, and according to Black Doom are symbols of the Black Arms' victorious conquests. They are also apparently poisonous, which may be why Shadow takes damage whenever he runs into them. Fortunately, Red Fruits are very fragile; any attack will cause them to splatter.
Similar growths appear dangling in Black Doom's fleet in Sky Troops and in the terraformed jungle landscape of Death Ruins.