Adlivun is the kingdom of Sedna, which is also used as s sojourn, a temporary purgatory, for the dead. The dead are purified there before being allowed to pass into the Land of the Moon, a more pleasant place. Only a few privileged people are allowed to directly pass into the Land of the Moon. A.G.H.
Grimal, Pierre, Larousse World Mythology, Secaucus, New Jersey, Chartwell Books, 1965, p. 443