Discuss the final usage of fire and the natural setting. Why is it significant that the Creature determines to immolate himself? Why is it appropriate that he will do this when he reaches the North Pole?

One of the first elements the Creature understands in his recollection is fire. At first, he finds the heat of a fire pleasant; when he puts his hand into it, he recalls the feeling of confusion that something could be capable of causing such disparate sensations. Later, when he has approached the cottage dwellers and been rejected, fire takes on another meaning. He immolates the cottage out of a sense of fury at what has happened to him. At the same time, revenge is "kindled" in his heart towards his creator.
After the Creature has returned to his creator, fire appears again; this time, the "fire of love" expresses his desire for a mate. Fire, then, has signified almost every emotion the Creature has strongly felt in his short life. It is fitting, then, that the creature seeks the opposite extremity—the "furthest corner of the globe"—to commit himself to fire and remove all trace of his being from the earth. He is determined to escape humanity as far as possible so that nobody else will ever attempt to replicate a creature such as him. He declares his desire to "exult in the agony" of flames, experiencing the simultaneous pain and joy he first felt when he put his hand into the fire.