The Rolent Sewers is the first dungeon of Trails in the Sky. While it may not be as complex as later locations, there are still key points of interest.

You first enter the Rolent Sewers during the training mission at the start of the game. The first time you enter this area, the enemies will be easily visible, but return visits will have the enemies behave normally.

Key locations include an Orbment Charge Station near the entrance and a chest with a Reviving Balm. In addition, there are also items available for two quests: Training - Retrieval and Find the Shiny Rock.