Glass from Leng

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Glass from Leng

Origin: “The Gable Window” by August Derleth and H.P. Lovecraft.


...a great round window of a most curious clouded glass, of which (Wilbur Akeley) said only that it was a work of great antiquity, which he had discovered and acquired in the course of his travels in Asia.
— August Derleth and H.P. Lovecraft, "The Gable Window"

The Glass from Leng is a large disk of cloudy glass, apparently imported from the Plateau of Leng, though it may have originated in the Hyades. It may be used as a window and gateway into various realms of space and time. To make use of the Glass from Leng, the practitioner must trace on the floor, in chalk, a complicated five-pointed star elaborated with intricate designs. Standing inside the star, the practitioner then utters the words Ph'nglui mglw'nafh Cthuhu R'lyeh wgah'nagl fhtagn. The glass then becomes clear and a scene becomes visible through it.

The scene revealed by the Glass may be a location on Earth, in the Dreamlands, on an alien planet, or in some stranger realm. What appears seems to be random. If there is a way to command the Glass from Leng to show particular scenes desired by the user, no record of the method is known to exist.

Investigators should be wary of attempting to use the Glass from Leng, because entities on the other side of the glass can pass through it. The only way to prevent them from doing so is to erase part of the star, shatter the glass, or both; this will disrupt the spell, though any entity or portion of an entity that has already passed through the glass will remain present.

Heresies and Controversies

The substance of the Glass from Leng is described in very similar terms to the substance of the Crystal of Zon Mezzamalech, and these two artifacts may therefore be related.

Associated Mythos Elements


August Derleth and H.P. Lovecraft, "The Gable Window" (1957)