In Norse mythology, the hero associated with the end of the world, Ragnarok, is Thor. Known as the god of thunder, Thor plays a crucial role in the apocalyptic battle that signals the end of the gods and the world’s destruction. He is famed for his immense strength, wielding the hammer Mjölnir, which he uses to fight against various foes, including the serpent Jörmungandr. Thor's involvement in Ragnarok embodies the themes of heroism, sacrifice, and the inevitability of fate in Norse beliefs.