Wicked: The Life and Times of the Wicked Witch of the West
"What a load of tripe," said Elphaba. "If it came from another world I shouldn't be able to read any of it. And I can make out a little."
"Even if it's as magic as he says?" said Sarima. "But you know, I believed him. He said that there's more congress between worlds than anyone would credit, that our world has attributes of his, and his of ours, a kind of leakage effect, an infection maybe." (18.104.22.168)
Turtle Heart tumbled to his knees. "She sees him coming," he said thickly, " she sees him to come; he is to come from the air, is arriving. A balloon from the sky, the color of a bubble of blood; a huge crimson globe, a ruby globe; he falls from the sky. The Regent is fallen. The House of Ozma is fallen. The Clock was right. A minute to judgment." (1.8.127)
"There is an otherworld," he said with certainty.
She felt chilled. She scooped Elphaba up and hugged her tightly. (1.5.33-4)