The unicorn began to walk toward the harpy’s cage. Schmendrick the Magician, tiny and pale, kept opening and closing his mouth at her, and she knew what he was shrieking, though she could not hear him. “She will kill you, she will kill you! Run, you fool, while she’s still a prisoner! She will kill you if you set her free!” But the unicorn walked on, following the light of her horn, until she stood before Celaeno, the Dark One.

For an instant the icy wings hung silent in the air, like clouds, and the harpy’s old yellow eyes sank into the unicorn’s heart and drew her close. “I will kill you if you set me free,” the eyes said. “Set me free.” 

The unicorn lowered her head until her horn touched the lock of the harpy’s cage. The door did not swing open, and the iron bars did not thaw into starlight. But the harpy lifted her wings, and the four sides of the cage fell slowly away and down, like the petals of some great flower waking at night. And out of the wreckage the harpy bloomed, terrible and free, screaming, her hair swinging like a sword. The moon withered and fled. 

The unicorn heard herself cry out, not in terror but in wonder, “Oh, you are like me!” She reared joyously to meet the harpy’s stoop, and her horn leaped up into the wicked wind. The harpy struck once, missed, and swung away, her wings clanging and her breath warm and stinking. She burned overhead, and the unicorn saw herself reflected on the harpy’s bronze breast and felt the monster shining from her own body. So they circled one another like a double star, and under the shrunken sky there was nothing real but the two of them. The harpy laughed with delight, and her eyes turned the color of honey. The unicorn knew that she was going to strike again. 

Clanging metal, smouldering hatred, and terror: vetiver, myrrh, patchouli, tolu balsam, black clove, bergamot, orange flower, and horseradish.