shadow game: Shadow of the Colossus (And some Ico) - Theories and story explanations (Spoilers!!)

I just finished SOTC, and i have so many questions, so how did these guys know Wander was here and how do they know him? What is Dormin and why was he

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I just finished SOTC, and i have so many questions, so how did these guys know Wander was here and how do they know him? What is Dormin and why was he