Final answer:
In Norse mythology, Thor dies after killing the Midgard Serpent during the events of Ragnarok, succumbing to its venom after taking nine steps.
Step-by-step explanation:
In Norse mythology, Ragnarok is the prophesied event that signifies the end times, involving epic battles and the death of many gods. Thor, the god of thunder, meets his end after battling the great Midgard Serpent, also known as Jormungandr. As prophesied, Thor manages to kill the serpent but is only able to take nine steps before succumbing to its venom and dying. This event is significant within the mythological tales as it marks the fall of one of the mightiest Norse gods during the cataclysmic events of Ragnarok.