Gre'Thor
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In the fictional Star Trek universe, Gre'Thor (in Klingon, ghe'tor or ghe''or) is the Klingon afterlife where the dishonored go when they die. It is the Klingon equivalent of hell and is guarded by a fearsome demon, Fek'lhr (roughly pronounced "Fek-Lar"; in Klingon, veqlargh). Those unfortunate Klingons who find themselves in Gre'Thor are faced with eternal torture by Fek'lhr and his demons; however, Klingon legend allows for souls to be saved from Gre'Thor, usually by heroic sacrifices performed by friends and family (Kahless, for example, once willingly journeyed to Gre'Thor to save his brother, Morath, and send him to Sto-Vo-Kor).
If a Klingon dies and is fated to journey to Gre'Thor, they will find themselves on the Barge of the Dead, which travels the 'river of blood' on its way to Gre'Thor. Klingon souls on the Barge are tempted by siren-like voices, masquerading as friends and family, who try to lure them off the edge and into the river. (As the Barge's pilot, Kortar, wryly points out, "There are things here much worse than death...")
Under normal circumstances it is difficult for the souls of dead Klingons to leave Gre'Thor, such as in the expression "I will surrender when spirits escape from Gre'Thor!" but the legend of Kahless does allow for such things. Another example is the mother of B'Elanna Torres, who was initially sent to Gre'Thor due to her daughter's misdeeds but was eventually released.
Gre'Thor also gives its name to the armouries in Star Trek: Armada II. Also the demon Fek'Lhr lends its name to the Klingon starship class.