Baldur is a figure from Norse mythology, known as the god of light, purity, and beauty. He is the son of Odin, the chief god, and Frigg, the goddess of love. Baldur is often depicted as a handsome and beloved figure among the gods, and his death is a significant event in the mythological tales. His demise is caused by a mistletoe dart, which was the only thing that could harm him, as all other elements of nature had sworn not to hurt him. This event leads to the onset of Ragnarok, the end of the world in Norse mythology, highlighting Baldur's importance in the mythological narrative.