[2] Dulness is the daughter of Chaos and "eternal Night", and her mission is to convert all the world to stupidity ("To hatch a new Saturnian age, of Lead").
In Pope's poem, she already has control of all political writing and seeks to extend her reign to drama.
Pope presents the power of Dulness as inexorable and irresistible, and in Book IV of the Dunciad B he asks only that she pause a moment to let him write his poem before she takes "the singer and the song" into her oblivion.
For Pope, who was a Roman Catholic, absolute monarchy, foreign language opera, flattery, the replacement of sound architecture for politically well placed hacks, the redesign of good (classically ordered) buildings, and the money grubbing of what would now be called the tabloid press are all signs of the triumph of Dulness over reason and light.
Each of these things represents choosing the less thoughtful over the more rational choice, each requires credulity and acceptance over curiosity and independence, and therefore Pope blames, at least as much as any agent of Dulness, an indifferent and uneducated public.