Question: I don't understand why Leviathans feed on humans. They were created before humans existed and were locked away before humans existed. Why do they feed on humans?
Supernatural (2005)
1 question in season 7
All Hell Breaks Loose: Part 1 - S2-E21
Continuity mistake: Before the Roadhouse fire, Ash and Dean are talking on the phone. Ash looks at his watch, on his left hand, it says 8:10, and has a black dial/face. As Dean and Bobby go through the rubble, Dean identifies Ash by his watch. Still on his left hand, it is now upside down, evident by the crown of the watch (used to move the hands of the watch) which previously facing his hand, is now facing his elbow. Also, the dial/face of the watch is now silver instead of black. This is a different watch, and was inadvertently put on the burnt arm upside down.
Dean Winchester: Come on man. I know Sam, ok? Better than anyone. He's got more of a conscience than I do. I mean the guy feels guilty searching the internet for porn.
Trivia: At the beginning, the cabin looks very similar to the cabin in The Evil Dead, even the swinging bench (although on the opposite side of the door). And the girl calls out the name Ashleu, Bruce Campbell's character in Evil Dead.
Answer: God created the Leviathans. These beasts were among God's earliest creations, predating angels and humans. Whereas Death "personally found them entertaining", God worried the beasts would, as Death said, "Chomp the entire petri dish" as they proved to be too strong, too hungry, and too destructive. Sometime after he bound the Darkness, God locked away the Leviathans in Purgatory - which Death reveals as being specifically created to contain Leviathans. In addition, after locking the Leviathans up, God devised a means of killing the Leviathans should they ever escape Purgatory. When He had the Word of God tablets created, God made one for the Leviathans in case they ever escaped, putting instructions for the weapon on the tablet as well as a warning about them. In other words, they feed on humans to make them stronger.