It's a type of super explosive
Now that the moon had shown up in the night sky and that too on a new moon day, Great Wolf was taking this chance and absorbing lunar light to unlock his dormant powers. This was the very reason for his body glowing blue.
The same was also applicable for Luo Rin or rather the spirit insider her. Sekhmet was absorbing the pure lunar light and using it to break through from her current level.
Back to the plot, the tale of the Fenrir was reverberating throughout the jungle. Not a single place was devoid of this voice.
Luo Rin was narrating it repeatedly to tell the world about the birth of a new King. Since ancient times Divine Beats were categorized into many types, and the Kings were the ones standing on the top of a particular species.