This might be some forbidden knowledge Christian LARPers might be after… sounds resonate with the 7 headed beast in Revelations. I had to delve into the Depths of Hell, and traverse through shite in a video game for this information.
Prime Evils:
Diablo , the Lord of Terror / Fear
Mephisto, the Lord of Hatred
Baal, the Lord of Fertility / Lust
Lesser Evils:
Azmodan, the Lord of Sin
Duriel, the Lord of Pain
Andariel, the Lord of Anguish
Belial, the Lord of Lies
Still figuring out the 10 horns part.