This is the worst destruction so far. Demons are loosed from the abyss super-charged to destroy. They themselves are indestructible. They appear to be giant insects from hell -- literally!
One third of the people are killed. Those who remain wish they could die but can't. Even then they do not repent. Murder, witchcraft, sexual immorality and thievery are the predominant sins. The only familiar description is the one of idols, so frequent in the Old Testament.
This chapter contains no worship, no singing, no praise -- just destruction, full of fear and pain.