Moloch was a demonic fertility deity, turned false deity, mentioned in varied theological writings; the most famous of which would be the Christian Bible.

Much like Baal and Mammon, the figure of Moloch was likely based on pre-Christian deities that were altered into demons with the rise of a monothestic belief system.

What qualifies Moloch as a villain, in our modern use of the term, was the hefty price the entity demanded from its followers. These sacrifices were namely a fiery killing of human life, often children, which would be burnt alive in the long feared ritual of human sacrifice.