The song "666 - The Enemy Within" by HammerFall is about a man who wakes up from a deep sleep with a mark and a wound on his body, which is bleeding profusely. He sees a man in the mirror who he does not recognize, and there are numbers screaming out to him. These numbers are the infamous "666" which is a symbol of the devil in Christianity. The man is in pain and starts to speak in tongues, pleading for help. He recites a mantra that involves praising the devil as a last resort. The song describes the man's struggle with the evil within his soul, which he sees as the enemy inside him, subjugating him. The chorus of the song talks about getting a holy crucifix and throwing it into Acheron on Styx, which are references to the underworld in Greek mythology. The lyrics also mention kneeling down in desperation and using oars to row across the river Styx, which was believed to separate the living from the dead. Overall, the song is a warning against succumbing to the evil within oneself and the dangers of turning to the dark side. It's a cautionary tale about the consequences of losing oneself to one's own demons.
