Also known as the Unspeakable Promise, this is a pact made with Hastur The Unspeakable. It derives from the pact in The Return of Hastur.

It was also the title of a roleplaying magazine.

The Encyclopedia Cthulhiana says...Edit

Bargain made with Hastur by unsuspecting magicians. The magician's side of the bargain may differ, but the end result is the same: the Old One possesses his or her body upon death, taking on a humanoid form with boneless arms. The Unspeakable Promise is also said to bind Shub-Niggurath in some manner.

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