Castle Greyhawk

The influx of trade, travelers, and treasure associated with this phenomenon has provided significant economic benefits to the nearby City of Greyhawk.

Sometime during this period, Zagig reappeared and managed to imprison the demon lord Fraz-Urb'luu in the dungeons beneath the castle.

The fiend was imprisoned there for at least 200 years but was eventually freed by a wizard and a cleric (probably Erac's Cousin and his adventuring companion Ayelerach).

"[citation needed] Because Zouken is known to be imprisoned somewhere on the central Flanaess, some believe he was one of the nine deities Zagig trapped at the Castle.

By the end of the adventure, Zuoken has been freed, Robilar who had been replaced by an evil double is back to his old self, and Castle Greyhawk is now some sort of multi-planar brigadoon.

Gary Gygax designed Castle Greyhawk as a locale for the amusement of his children and friends and as a testing ground for the game of Dungeons & Dragons that he developed with Dave Arneson during 1972/73.

Dungeon levels were written at the rate of one per week as those adventures progressed, leading to the original thirteen-level castle.

A second version of Castle Greyhawk was developed/created prior to the publication of Dungeons & Dragons by incorporating Rob Kuntz's "El Raja Key" (also commenced in 1972), which had been created to allow Gygax to adventure using his own PCs such as Mordenkainen.

In 2005, Troll Lord Games began publishing "Castle Zagyg" in a number of volumes authored by Gary Gygax and Jeffery P. Talanian.

These adventures are based on Gygax's original Castle Greyhawk dungeon design and campaign but are not official D&D materials.