The outer sacred chambers of the Timeless Halls are known as the Outer Halls. These lesser halls are the furthest heights in which the Implementors are permitted. Here they frequently gather to discuss the ongoing processes with Implementors of other universes.

Each universe consists of multiple Ethereal Planes, all connecting to a section of the Outer Halls designated for that respective universe, which in turn is connected to the Inner Halls.

SOURCE(S): Beyond Zork, The Zork Chronicles, A History of Quendor, Zylon the Aged