A massive cave system below the continent of Aurelia. It only connects to the surface in very few places and as a result there is very little interaction between the surface and the underdark. The aurelian underdark can be roughly separated into five regions, each with their own distinct eco system and political landscape. These regions are largely separated by natural barriers in some cases and in others are more strongly connected.
Istros
A large region in the south of the underdark. It is dominated by verdant mushroom forests. The region has many small rivers and lakes which are fed from the ceiling as it constantly rains in this region, with some a large waterfall fromt he surface in the north east. This region has the highest natural biodiversity.
Narad'dum
The central region of the underdark. The entire region is necrotic and full of undead.
Ondrodos
A dry region connecting Istros with Urok. There is fairly little life here.
Urok
Southeastern region of the underdark.
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