N/Atlas/Xabuvio
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Xabuvio is a pit supposed to be bottomless, though it does end eventually. Using the Planar Theory, one can conclude that Xabuvio ends at the border of the Underworld. However, Xabuvio is not a portal as it detracts the Underworld's curve due to its blessing from the Overworld.
One case where its depth to the Underworld was used was in the execution of Mordin, who was able to perform the ritual of becoming a dark lich during his long fall and was accepted due to his physical proximity to the Underworld.
