Rosen Queen (evil symbol)

Rosen Queen is an Evil Symbol from Disgaea 4: A Promise Unforgotten. The bill to unlock it becomes available at the start of Chapter 3.

Having it placed opens up the Specialty Shop, which sells Accessories and HP/SP healing items. The items available at the shop depend on the tiles of the Cam-Pain HQ covered by the Symbol and its Evil Area, though the stage corresponding to a tile must've been completed first for the shop to include it.