Mirai
From Age of Sigmar - Lexicanum
Mirai was, in the myths of the Idoneth Deepkin of the Green Gulch, a collection of underworlds of the World-That-Was where the souls of aelfkind went after they died.[1a][1c]
History
World-That-Was
During the end of the World-That-Was the gluttonous Slaanesh broke the gates to Mirai open and consumed the aelven souls within.[1a]
Beliefs
The Idoneth of Green Gulch believed that black-finned néthir guided souls through the gates of Mirai.[1b]
Trivia
There is an order of funerary priests in Briomdar known as the Mirai Wardens.
Sources