The Sewers is a location in Stardew Valley. Located south of Pelican Town in Cindersap Forest, the Sewers is initially inaccessible. To gain access, the player must receive the Rusty Key, an item that is rewarded by Gunther after donating 60 items to the Museum, and can then be accessed from Pelican Town or at the far southeast area of Cindersap Forest.
Krobus resides within the eastern portion of the sewer.
Seal of Promise[]
The Seal of Promise is the result of an event that is activated in the Sewer involving both Krobus and the Dwarf. Head to the sewer to activate a cutscene. In this cutscene, they establish that the dwarves and the shadow people had been at war for a 1000 years, and the war recently ended. The Wizard then intervenes and casts a "Seal of Promise" to keep the two separated. It is unknown how this effects the story or gameplay.