Tartarus

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The subterranian network of caverns, tunnels and cities that runs underneath the surface of many places across the globe. Tartarus is the land of Demons, dark Spirits and, most infamously, Tartarian Beasts. It also houses the Dark One and all its subordinate monsters.

Tartarus is commonly split into underground "continents" based on the fact that communities and cities have been built up beneath large mana pools, just as they have on the surface.