Actually when 99 relics/emp are thought of this way, that 2nd half of lvl 99 only makes sense for Gjallarhorn and Daurdabla. They have always been about buffing those around them. The fact that they may not get afterglow is kindof ironic. Granted yes trigger would probably have to be every X amount of songs, or X combo of songs or something brand new. In a way the weapons are acquiring what was once horn and harp only.