Ally

“The most professional curse ever snarled or croaked or thundered can have no effect on a pure heart.”
― Peter S. Beagle, The Last Unicorn

“Alas," said Aslan, shaking his head. "It will. Things always work according to their nature. She has won her heart's desire; she has unwearying strength and endless days like a goddess. But length of days with an evil heart is only length of misery and already she begins to know it. All get what they want; they do not always like it.”
― C.S. Lewis, The Chronicles of Narnia

“I'm hunger. I'm thirst. Where I bite, I hold till I die, and even after death they must cut out my mouthful from my enemy's body and bury it with me. I can fast a hundred years and not die. I can lie a hundred nights on the ice and not freeze. I can drink a river of blood and not burst. Show me your enemies.”
― C.S. Lewis, The Chronicles of Narnia

“Then what is magic for?" Prince Lír demanded wildly. "What use is wizardry if it cannot save a unicorn?" He gripped the magician's shoulder hard, to keep from falling.

Schmedrick did not turn his head. With a touch of sad mockery in his voice, he said, "That's what heroes are for.”
― Peter S. Beagle, The Last Unicorn