The basalt fortress was the headquarters of Lord Asriel's operations for overthrowing the Authority and was located in the Republic of Heaven.[1]


The fortress was located on the peak of a mountain range in the Republic of Heaven. The range had sawtooth ridges and black rock.[1]


The battlments of the fortress were formed of slabs of basalt about half a hill in height. Below, there were huges fires where blacksmiths worked.[1]


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HDM Wiki has 1 image of the basalt fortress.


  1. 1.0 1.1 1.2 The Subtle Knife, Chapter 6
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