Players of Warp Portal's cute fantasy MMO ROSE Online will "soon" (the date is TBD) enjoy an update that brings them to Sikuku Underground Prison and the Dark Sewers to fight purveyors of evil like Battle Executor Ul'gath, Dark Shaman Ranka and Gloopy (wha...?).
Details are sparse at this time, so if you've always dreamed about exploring a Dark Sewer, keep checking the ROSE Online website.