Rheagar's Sisters

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Compared to the surface, the undercity was a dangerous place.

Not only were there many underground residents hiding in the shadows but there were also dark creatures from the Shadow Plane or the Evil Spirit Plane.

In the Hundred Cities Division Plan.

The Seven Saint Alliance had once warned the mages of the various city-states that if they wanted to develop the underground space of their city, they must strictly abide by the 300-meter rule.

In other words, the depth of the tunnel could not exceed 300 meters.

In actual practice, it was the safest to operate within 180 meters.

In the history of Aindor, it wasn't rare for a city to be destroyed because the people dug too deep.

The undercity had another set of survival logic.

This was also related to the fact that the Calamity Mage did not touch the dark gods hidden underground when they were exiled to the Heavenly Palace.