Barbara seems to be dying but her concern is for Sophie.
On Barbara's suggestion Sophie imagines herself into Immateria and meets some strange creatures.
They're fascinating, they symbolize our state of confusion.
This is a beautiful explanation of Immateria a.k.a. The Misty Magic Land a.k.a. Imagination.
Sophie became somewhat distraught when Jack told her that Promethea would end the world. It isn't so bad after all, quite the opposite. Here is what it means.
If Promethea is so wonderful why is she being hunted? Here's the answer.
Moore is defining levels here. First is the Material plane. Then Imagination. Then Emotion. Then, last of the human planes, the Soul. Beyond lies Absolute and Universal forces. Then the realm of Judgment. Then the Realm of Mercy. Margaret actually takes Sophie through these realmns in beautifully illustrated panels like these:
Eventually, in her journey in Immateria. Sophie winds up here: