Seiðr is a form of pre-Christian Norse magic and shamanism practiced by the Norse and Viking cultures. It involves rituals and techniques aimed at divination, healing, and influencing the natural world. Practitioners, often called völvas or seeresses, would enter altered states of consciousness to communicate with spirits and gain insights. The practice of seiðr is closely associated with the goddess Freyja, who is considered a master of this magical art. It was typically performed in a communal setting, where participants would engage in chanting, drumming, and other activities to enhance the magical experience.