Thor's magical hammer in Norse mythology is known as Mjölnir. This formidable weapon embodies the power of thunder and lightning, serving as a symbol of protection and strength. Mjölnir is not only a tool for battle but also acts as a blessing for fertility and abundance, emphasizing the interconnectedness of destruction and creation. Thor's hammer plays a crucial role in mythological battles against giants, protecting both gods and humans, and signifies the hero's responsibility to maintain order in the cosmos.