Valhalla ("Hall of the Slain") is the afterlife realm in Norse mythology for fallen heroes selected by Odin’s Valkyrie to become members of the army that will fight against the forces of chaos at Ragnarök. The concept of Odin’s Hall seems to have developed from an earlier vision of a warrior’s afterlife as a battlefield.
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c. 1220Valhalla is fully described in the Prose Edda by Snorri Sturluson which drew on earlier works of Norse mythology.