Creation

''"It is time that Mannkind and its allies flourish and the Hundish Race be cleaned away like the stain they are from the fabric of Creation once and for all." ''

—Klinde Creation was a term used to refer to the entirety of the cosmos.

Nine worlds
There were said to be nine distinct "worlds" in Creation, though only three were known as of the time of the events of The Sword and Its Servant: Klinde made reference to "the Higher Worlds" when divulging to Einsa the concept of an afterlife. It was not clear which Worlds or how many there might be that are considered in this category. It is made clear that the Ærth is "above" the Grauwelt, which in turn is "above" Hel, regarded as the "lowest" of all Worlds in Creation.
 * the Ærth
 * the Grauwelt
 * Hel

World Walking
It was possible to travel (or "walk") between worlds. This practice was very rare and seemed to have been lost with the fall of Dietrich and the Great Hund.

World Walking required special tools made for this purpose:
 * Dietrich's Ring
 * the Türs

Real-world inspiration
The concept of the universe being divided into nine distinct worlds is derived from the legends of Yggdrasil, the Norse myth of a "cosmic tree" (an ash tree) on which the different worlds were suspended on the various "branches" (the underworld was at its roots).

In Norse myth, the various worlds all had a different environment and physical makeup and were each home to distinct creatures.