The Eterna Mountains

The range where the gate appeared, ceded as demon territory on the human side under the Treaty of Hope.

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Former Lindsey frontier

The Eterna Mountains were Lindsey territory when the Gate appeared. The Treaty of Hope transferred the range to demon authority on the human side, leading Victor’s attempt to reclaim it and the First Transgression.

Road to the Tower

The Tower occupies the highest peak. Volume II makes the approach tangible: the Dark Forest clings to its base, the mountain path is brutally steep, and the summit is avoided by monsters because the Tower’s mana announces an unwinnable fight. The mountains are also where Satomi’s refuge and Shun’s later removal into demon custody begin.

Referenced by

Victor the Third— character
The Dark Forest of Eterna— location
The Tower— location
The First Transgression— timeline