They came from Zelkor's Ferry
Rumors About Rappan Athuk
Zelkor, the good wizard of old, is now an evil lich living in the upper levels protecting the evil temple and descent into it.
A great library, once the property of the followers of Orcus, lies forgotten in a hidden level. Though it contains works of great evil, it also holds books that could be of great value to sages and adventurers as well.
On the fourth level, there are no monsters, but wondrous amounts of gems.
In the lower levels, spells cannot be regained due to the evil powers in this place. Conserve spells on deep treks.