Nihil

In the Underworld, a Nihil is a hole that connects a location to the Tempest or the Labyrinth. Nihils are a common (if dangerous) form of wraithly transport - any wraith skilled in Argos can jump into the Tempest through a Nihil and travel with relative safety, although any other wraith is gambling with his existence. Nihils can be two-way, although certain ones have a definite suction - generally towards Oblivion.

The majority of Nihils are natural events in the Underworld, and are viewed by most wraiths as a form of hazardous waste - Spectres can exploit these portals into the Labyrinth, and creatures from Oblivion can step out of them. In addition, they have a hypnotic effect on wraiths, who often hear sounds of moaning or odd songs leaking out of them. Nihils often appear in sites of great suffering or pain - places where Oblivion is strong.