Dissidia Final Fantasy: The Third Offspring

It was once believed in this barren world that Cosmos, the Goddess of Harmony and Chaos, the God of Discord, were once lovers before their never-ending war. Ever since their deaths, they were reincarnated in the forms of two new Gods. Materia and Spiritus.

However, long before Materia and Spiritus existed, there was another. A direct child spawning from Cosmos and Chaos.

How will Materia and Spiritus react and more importantly, will their warriors abandon them for this third offspring?