The fifth angel poured out his bowl on the throne of the beast, and its kingdom was plunged into darkness. People gnawed their tongues in agony 11 and cursed the God of heaven because of their pains and their sores, but they refused to repent of what they had done. (Revelation 16:10-11)
The “bowl judgments” of Revelation chapter 16 are full of poetical justice. Earlier in verses 3-7 God bathed the kingdom of the beast in literal blood, as a consequence of all the innocent blood that they were guilty of shedding. Now, as the fifth bowl is poured out, God fills the kingdom of the Beast with literal darkness. All along, of course, this kingdom was characterized by spiritual darkness. Perhaps God is given them a taste of what hell will be like. This darkness is apparently accompanied by deep physical pain, possibly as a result of the sores that the followers of the Antichrist received back in verse 2. The recipients of God’s judgment here prove just how much they are in spiritual darkness here by daring even now to curse “the God of heaven” refusing “to repent of what they had done.” They are so selfish and in love with their sins that they will not repent, even when it has become clear that they cannot defeat God.