The Sea of Glass
“2 And I saw as it were a sea of glass mingled with fire: and them that had gotten the victory over the beast, and over his image, and over his mark, and over the number of his name, stand on the sea of glass, having the harps of God.
3 And they sing the song of Moses the servant of God, and the song of the Lamb, saying, Great and marvellous are thy works, Lord God Almighty; just and true are thy ways, thou King of saints.
4 Who shall not fear thee, O Lord, and glorify thy name? for thou only art holy: for all nations shall come and worship before thee; for thy judgments are made manifest.”
(Rev 15:2-4 KJV)
Seven Last Plagues
“And I saw another sign in heaven, great and marvellous, seven angels having the seven last plagues; for in them is filled up the wrath of God.” (Rev 15:1 KJV)
Chapter 15 sets the stage for the last seven vial judgments. These judgments cover the last 3.5 years of the Great Tribulation period and cover chapters 16-19. These are the seven last plagues seen here and are called the judgments of the “seven golden vials”. These are the last judgments before the Battle of Armageddon.