Revelation 16:8-12

And the fourth angel poured out his bowl upon the sun, and it was given power to scorch people with fire.

And the people were scorched with fierce heat; and they blasphemed the name of God who has the power over these plagues, and they did not repent so as to give Him glory.

And the fifth angel poured out his bowl on the throne of the beast, and his kingdom became darkened; and they gnawed their tongues because of pain,

and they blasphemed the God of heaven because of their pain and their sores; and they did not repent of their deeds.

The sixth angel poured out his bowl on the great river, the Euphrates; and its water was dried up, so that the way would be prepared for the kings from the east. Har-Magedon (Armageddon)