The Lost City is a city-like zone in the desert between the Far Oasis and Valley of Snakes. After the players enter it for the first time, a sudden eclipse occurs, the Tainted Sun quest would activate and plunge Sanctuary into a perpetual nightfall until the Tainted Sun Altar in the Claw Viper Temple is destroyed.

A trap door found within the city leads to the Ancient Tunnels, an area not unlike the Sewers beneath Lut Gholein.

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