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"In his house at R'lyeh, dead Cthulhu waits dreaming..." - English translation of Aklo verse
This article is written on a topic within the Greater Cthulhu Mythos based on information from works in the Mythos. By default, all information is to be assumed to derive from the Lovecraft Myth Cycle unless otherwise marked.
'Umr At-Tawil, (The Most Ancient One, The Guide, the Prolonged of Life), is an entity who stands beside the Ultimate Gate, meeting any who traverse the first Gate via the Silver Key. He appears as a heavily cloaked, vaguely humanoid figure, with no organs or features discernible beneath his garb.