The "hole" in the middle of Euthville Ruins.
A mix of small and large rooms, with a massive monster population. The difficulty increases each level, and the layout makes range spells and combat very challenging.
Level 12 to 15 for "fighters" and level 17 or higher for spell casters.
Fire Elementals, Earth Elementals, Hill Giants, Wyverns, Trolls, Raas, Beholders, Giants Bats, Kobolds, Xans, Angels, Panthers, Bats, Behemoths, Red Dragons.