This, together with Linker and Re-Nation, was one of the three Hymmnos crafted during the time when the First Tower was being built. Its function is putting the Tower in Sleep Mode (shutting down the system infrastructure called SIS), rendering all Song Magic useless and taking the Administrator with it, as she cannot stay conscious due to her conscious self being part of the SIS. However, all the vital facilities of the Tower such as the SH Server, the Musical Corridor and the Plasma Bell remain active, as they were created after the Tower's completion and are managed under a different administrative system, the BIS. Similarly, Grathmeld is still possible because the Silver Horn is also considered as a part of the BIS.