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The dronia sewers are an old piece of infrastructure in disrepair, from the same era as its old brick industrial buildings. Gross gunky brick walls with maybe some graffiti, pipes and planks of wood and stuff sitting around.
The main point of the sewer is to acquire items. Some medium usefulness single use items can be strewn throughout the dungeon. The main content is the "dojo of hobos" at the end, similar to the Saffron Dojo you fight a small number of hobos without break, leading to a leader hobo. If you can win you're crowned king of the sewer hobos and are given an item, like a good HM, or maybe a pokemon, like a Chimpoca.
SMOKEY NOTE: These descriptions are being taken from the concept submissions directly. Specific details of these concept submissions are subject to change and may have already been changed. Same goes for any concept art for locations with unconfirmed maps.