| Category | Strongholds |
| Continent | Karterus |
| Region | Ma'Ohari |
| Alias | Gu'sax 12 |
| Owner | Malshirk'iss |
| Built | 4 Lunar 160 GE |
| Map | Tha'lith |
In the Tha'lith Front (153 GE - 176 GE), demons alongside thousands of Tragaran slaves under Graz'zt, built Gu'sax 12, or Fort 12, to secure the lands around.
In the Tilnangau-Varelay War, this place was captured by Varelay. It was renamed Mo'tzor in honor of Aperoq's most trusted chronicler; one who died for being a bit too truthful in his writings on his master.
In the Varelay Upheaval (2608 LE - 16 HE), the water table shifted giving birth to lake Styming. This submerged the defile, the main entrance and the lower levels of the fortress. An island fortress with submerged parts, it became the home of Vedrii and Yuan-ti.
When Malshirk'iss came to power, Mo'tzor was captured from a Rikhirra conclave. All killed, these naga were later raised, becoming Malshirk'iss's bone naga command staff.