This plug-in adds an extensive underworld to Suran which, reasonably enough, can be found underneath the city. Just look for a couple of trap doors one in the basement of the Suran Temple, the other in a storage room in the guard tower near the silt strider port.
Included in this version is a criminal organization called the BloodFang Tong which, through the course of 20 quests, a player may rise to lead. This version also delves into the mystery of the ring, Aktheron, which the player will acquire during the course of a Tong quest. Solving the riddle of the ring involves an in-depth quest (roughly the equivalent of five Faction type quests), and the player may find themselves in possession of an expandable castle complex (once the current owner is dispatched). This mod is recommended for 20th level (30th level is better) since the BloodFang Tong difficulty level is on par with Tribunal, and the Aktheron difficulty level is on par with Bloodmoon. Both Tribunal and Bloodmoon are required to use this mod.
Keep in mind that the BloodFang Tong is a CRIMINAL organization. You are not going to find much in the way of Robin Hood quests, just the normal run of the mill extortion, murder, revenge, and theft type quests. Paladin’s will probably have some difficulty rationalizing this one. Through the course of the Tong quests the player will acquire a residence which is expandable. This residence reflects my own preference for comfortable and elegant rather than huge and ostentatious. For those with more grandiose tastes there is an expandable castle complex that can be acquired during the Aktheron quest.
World Edits
Extensive edits to exterior cells, adding numerous new locations, including to many vanilla towns and cities. Includes a new landmass with landscape edits, buildings, and associated interiors just south of Vvardenfell.
Other Notes
A number of compatibility patches exist for Suran Underworld, but notably, due to the extensive nature of the world edits, it will likely conflict with quite a few mods. Some landscape edits come very close to Tamriel Rebuilt.