Eldritch (KQGS)

Eldritch is a kingdom mentioned King's Quest Chapter I: A Knight To Remember, it is a reference the kingdom originally appeared in King's Quest VII: The Princeless Bride.

Background
Eldritch apparently a country that lies on the same continent as Daventry not too far from the Kingdom of Daventry itself and Serenia. It known to be the home of Susan the skulking crystal dragon. Olfie, Susan, and Bill the Yeti of Serenia which are known to visit each other for tea.

Behind the scenes
In the original games, marketing and published hintbooks Eldritch was described to be in another world (a parallel universe), 'a land beyond dreams', one that could only be entered through a magical portal such as from the Looking Pool in Castle Daventry's garden. This was likely inspired by similar idea in the Narnia books, which had passages between worlds in the form of pools (in the Magician's Nephew), or by other methods.