Shadow of Colossus

As you can see, Colossus confidently stands upon the earth, unchallenged and undefeated. What does this statue mean, and why is it composed of different metals?
This statue is from a dream that the King of Babylon had 2500 years ago, found in the second chapter of the book of Daniel in the Bible. Hidden in that prophecy is the meaning of all human history from that time until these days, the “end of time.”