Vistra
Vistra is the capitol of the Underworld. All roads lead to Vistra, as most of the land's trade takes place here. The city is large, even by city standards. It has many hotels, pubs/taverns, restaurants, apartments, markets, stores, and a few nice suburbs. As well as a few parks for children to play. Anything can be found somewhere in the city. Whether you are looking for something in the black market in the southern part of the city, or looking for a fancy shirt in the fashion hub of Vistra.
Theyolus
Theyolus is the second largest city in the underworld, located near the center of the Nightstand Desert. Due to it's location, it is always night there. It's a hotspot for all sorts of nocturnal creatures to live. The city is a dangerous place for the unwary, and no place for the weak.
Ignira
Ignira is located on the eastern shore of the Sea of Fire. Third largest city, and home of the fire elementals. As well as the last stop before reaching the Mountains of Dread. Ignira is like a smaller, hotter version of Vistra. It would be a good idea to bring something to keep you cool if you visit the city.
Dragolund
Dragolund City is the smallest city in the Underworld. Located on Dragon-Claw island, its the trade hub of the island. It's boats travel to Zaveya Ports just west of the Gratta Mountains. The city itself is inside the massive trees that covers most of the island.