The Hole
The Hole -- officially known as The Ruins of Old Paineel -- was created at the end of the Erudin/Heretics war, when the Heretics used their magical powers to punch a hole in the earth deep into the depths of Odus. Within this deep shaft they built their city of Paineel. However, they penetrated too deeply and, unknown to them at first, they had touched upon the Plane of Underfoot itself, which had been cast onto the earth in eons past. In the years after the city was built, they became aware of the enemy below them and attempted to block them in, but with the arrival of the great Master Yael, the elementals and minions of Brell Serilis swept through the city on one gruesome night, destroying everything in their path. The Heretics were forced to retreat to their highest outpost, the site of the current city of Paineel.
See also Wedar's Guide to The Hole
The original source continues with tabular game data (maps, spawn tables) omitted here. See it at the source ↗