A Qlippoth (plural Qlippothim) is a rejected world that contains a half-made universe inhabited by creatures from before the creation of the modern Tapestry.
Its essence is not necessarily evil, but dangerous to mankind and the universe they have grown accustomed to. Some Qlippothim contain absolute aspects of God, which would render free will impossible and would allow no evolution of life, while others contain even more esoteric concepts that are too alien for the human mind to grasp.
Early infernalists called the Qlippothim the Nine Keys of Hell or the Nine Breaths of the Absolute, mocking the Egyptian concept of the Nine Cornerstones of Creation. The Order of Hermes, while borrowing lore from the Ahl-i-Batin, first defined the term in regard to the Spheres, with the Qlippoth representing its antithesis. Manipulating the essence of a Qlippoth is the purview of those who have entered the Cauls and were remade.
A Qlippoth is a kabbalistic term meaning "shell".