This is one of the multiple Songs that are used to control the robot army used for protecting Frelia and the Second Tower, known as the Divine Army. However, each robot has an specific song that corresponds to their serial number, so there isn't a centralized control Hymn for all of them, which is done as a security measure to prevent any Reyvateil from controlling all the robots at the same time and potentially triggering a world-ending catastrophe. It's for that same reason that all of these Songs are stored in single-use Hymn Crystals, so they will disappear after being Downloaded once. This Song in particular controls the Divine Beam, which is like a commander unit for the entire Divine Army.