In Keeping with Kaide, The Drowned Mild, Mantras are "An affordable imitation of the ability held throughout the Tune that Drowned Gods wield as their birthright", implying that they're an inferior kind of the song's real energy, which are not intended for humanity The Chinese translation is 真言; zhenyan; 'true https://www.youtube.com/shorts/x-uzzNOcLMQ