SPOILER
>
>
>
>
>
>
>
>
>
>
There are three Easter Egg Dungeons (that I know of anyway): one in the graveyard (Arnika-Trynton road), one in the Northern Wilderness, and one in the Mountain Wilderness. You can use Detect Secrets to help you find the entrances to each, or you can
check here for maps(just follow the links to Wizardry 8 and then to Rune Puzzle).