The Earth God and the Dark Goddess

The Olun speak of a song discovered through the succession of the Earth God, Tunta. From there, I found the story of the "Azure Flame," a gift said to have been given by Tunta to the Dark Goddess. This flame is said to hold protective magic power, capable of shielding the land from external calamities. It's ignited with the ground Tunta's sharp horn. But why was Tunta so favorable towards the goddess? - Orze