This is a metal song. It's very heavy/screamy. But it's supposedly about Magneto. The chorus proclaims "Free your mind/trust in me/ i'll show you what it means to feel complete" which is technically addressed to mutants. Could it also be a call to satanism? No, I'm just crazy. I'm no PMRC nut. But also you should think about how similar those two characters are. Give up your humanity/soul and become something more. Align with my power and I will free you of petty morality. Etc.
Basically, Magneto is Satan. Thanks for clarifying that Within the Ruins. I appreciate it.
