In 2 Thessalonians 1:7-8, the Lord Jesus is revealed from heaven with His mighty angels in what?

Answer: Blazing fire

The Lord Jesus will be revealed from heaven with His mighty angels in blazing fire (KJV: flaming fire).

“and to grant relief to you who are oppressed and to us as well. This will take place when the Lord Jesus is revealed from heaven with His mighty angels in blazing fire, inflicting vengeance on those who do not know God and do not obey the gospel of our Lord Jesus.”— 2 Thessalonians 1:7-8 (BSB)