When Randolph Carter visits Atal in The Dream-Quest of Unknown Kadath (1926), he is the patriarch of the Temple of the Elder Ones and is now well over 300 years old, "but still very keen of mind and memory".
According to the story, Sansu is "written of with fright" in the Pnakotic Manuscripts, having once scaled the mountain of Hatheg-Kla "in the youth of the world" and found "naught but wordless ice and rock".