Idrongrun is a large swamp in the southern reaches of the valley Mauhúl. The swamp is vast and haven to an array of insects, some are undead insect swarms. Even those creatures with the hardiest of constitution have caught terminal diseases in this wretched smelling wetland. Trolls and black dragons are the top predators of Idrongrun. Some of these creatures are pressed into the armies of the Orchish Empire. The black dragons of this wetland frequently fight with the many blue dragons coming out of the Giant Steps. Idrongrun borders the Foronir river. The massive amount of water flowing down this river is the reason this swamp is so large.
Beyond the living dangers of the swamp, are natural dangers like quicksand, disease, and an abundance of hydrogen pods.