C. S. Lewis's The Last Battle includes a scene of what amounts to the Last Judgment (I don't recall the exact chapter, but it's toward the end of the book):
The creatures came rushing on, their eyes brighter and brighter as they drew nearer and nearer to the standing Stars. But as they came right up to Aslan one or other of two things happened to each of them. They all looked straight in his face, I don't think they had any choice about that. And when some looked, the expression of their faces changed terribly - it was fear and hatred: except that, on the faces of Talking Beasts, the fear and hatred only lasted for a fraction of a second. You could see that they had suddenly ceased to be Talking Beasts. They were just ordinary animals. And all the creatures who looked at Aslan in that way swerved to their right, his left, and disappeared into his huge black shadow, which (as you have heard) streamed away to the left of the doorway. The children never saw them again. I don't know what became of them.
Is C. S. Lewis endorsing annihilationism (i.e. "conditional immortality", where some people become immortal and others either cease to exist or cease to be conscious) here?
His statement that "You could see that they had suddenly ceased to be Talking Beasts" and that they "disappeared into his huge black shadow" seems to suggest "yes," but his statement that "I don't know what became of them" seems to suggest that Lewis is deliberately trying to avoid taking a position on exactly what happened to them.