“For they are the spirits of devils, working miracles, which go forth unto the kings of the earth and of the whole world, to gather them to the battle of that great day of God Almighty.”
King James Version (KJV)
Re 16:14 For they are the spirits of devils. The Greek is "demons". They are demoniacal influences, and will show forth false miracles by which to deceive men. To the kings of the earth and of the whole world. They will marshal their forces for the last conflict. The conflict that shall then take place will decide the fate of Babylon. The drying up of the Euphrates will prepare the way for its destruction. For an account of the battle of that great day, see Re 19:11,19.