Shadow is the Summon Spirit of Darkness in Tales of Symphonia. You can find him in the Temple of Darkness in the world of Tethe'alla. Shadow does not talk and can also split himself into 5 miniature shadows which you have to collect before you can fight him. Sheena Fujibayashi can only summon Shadows while she is in Over Limit mode. When she decides to summon Shadow or any other summon spirit, she says the following words. "I call upon the envoy from the dark abyss! I summon thee, come Shadow!" When Shadow is summoned he rises from the ground and attacks the enemies with waves of darkness.
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