As we read Revelation 16:13-16, we can see at what the warning, given in picture language, is driving. In The New English Bible the verses read:

¹¹ “Then I saw coming from the mouth of the dragon, the mouth of the beast, and the mouth of the false prophet, three foul spirits like frogs.

12. (a) What really are those three froglike spirits that come out from the mouths of “dragon,” “wild beast” and “false prophet”? (b) To what are such “spirits” leading all mankind?

¹² The “foul spirits” that hop “like frogs” out of the mouths of the dragon, wild beast and false prophet are not literal spirit creatures such as devils or demons. Since they come out of three mouths, they picture propaganda, in this case propaganda as foul as frogs that puff themselves up and make a dismal croaking sound. The propaganda is forceful, with a driving or persuasive power. Accordingly, the New World Translation of the Holy Scriptures says: “They are, in fact, expressions inspired by demons.” They are “unclean inspired expressions” that come out of the mouths of the dragon, wild beast and false prophet. To what are those forceful expressions leading the rulers of the people? To no other eventuality but “the war of the great day of God the Almighty” at Har–Magedon. Yes, they are leading to war, not a war between man and man as in a nuclear third world war, but a war between man and God. Is this not something of the most serious kind? Indeed it is!