Norse paganism was a folk religion (as opposed to an organized religion), and its main purpose was the survival and regeneration of society. Therefore, the faith was decentralized and tied to the village and the family, although evidence exists of great national religious festivals. Some Aesir (principle god's) include: Odin, Frigga, Thor, Loki, Baldr and Tyr. Some secondary gods are the Vanir: Njord, Freyr and Freyja. Odin lives in Valhalla (Hall of the slain), and he invites those who have died in battle; Freyja also invites those who have died in combat to her fields Folkvangr. Frigga is Odin's