Ultimate Gate

The Ultimate Gate is a gateway through space and time. It is guarded by 'Umr At-Tawil, as well as Yog-Sothoth, and can be accessed through the use of the Silver Key. Among other things, it allows one access to all of the possible lives one may live or have lived; for example, Randolph Carter was able to enter the mind and body of Zkauba, an alien mystic who existed along a divergent spatial and temporal continuity from Carter's own existence.