The House Of Asterion by Jorge Luis Borges

A solitary, first-person account by a monstrous inhabitant of a vast, self-contained labyrinth who insists on the purity and nobility of his existence while describing his daily rituals, boundless rooms, and patient expectation of a visitor who will free him from his solitude; he imagines himself a king and redeemer, wandering corridors and rehearsing his innocence, until the narrative's twist reveals that his visitor is a human hero who enters to kill him, reframing the tale as a meditation on loneliness, identity, and the nature of imprisonment.