| Category | Labyrinths |
| Continent | Brucrumus |
| Region | Imgangreth |
| Map | Kazgon |
Underneath the sprawling metropolis of Collossapolos lies an extensive network of chambers and corridors known as The Twelve Tiers. This subterranean domain also houses the city's intricate sewer system, which ultimately discharges into the Underdark below.
The majority of The Twelve Tiers remain uncharted. This limitation is a consequence of the Map Restrictions law enacted by the Orchish Empire; a security precaution in the event that hostile entities attempt to utilize the Underdark to assault the city.
The subterranean levels beneath Collossapolos number twelve. The majority of these intricate labyrinths and passages were expanded during Monty the Mad's quest for a powerful relic known as Tiamat's Spur.
The twelve levels under Collossapolos:
| Level | Name |
|---|---|
| 1 | The Rat Catacombs |
| 2 | Ancient Shrine Of The Toad |
| 3 | The Fungi Maze |
| 4 | Hold Of The Dark Orbs |
| 5 | Glow Bog |
| 6 | The Gas Vaults |
| 7 | The Boiling Lake |
| 8 | The Deep Ones |
| 9 | The Long Walks |
| 10 | Worm Way |
| 11 | Tentacle Ones |
| 12 | Brotherhood |