Redias called Akira the hero of Chaos,
She believes Akira is a subject of the goddess of evolution, Ruin Chaos,
The other goddess who appeared to Akira when he first used Soul's power.
The Goddess of creation is called Artesia Gaia, and the three goddesses mentioned at the beginning
Waruna-Bal-Negasus The Supreme Goddess, Freya-Luin-Miraya Goddess of compation,
and Madeline-Den-Del Goddess of elements, the 3 of them are actually AIs that helped Artesia create the world Althearad.
This is explained in another manga about the genesis of that world, called Ponkotsu Megami no Isekai Sousei-roku.
https://mangadex.org/title/c30a35a6...d3cc28f/ponkotsu-megami-no-isekai-sousei-roku
It tells how the goddess Artesia Gaia created the world Althearad and guides humans to prosperity,
and how Ruin Chaos helps a human Icarus Enrir to become the Evil God,
He is the same evil god that the cult wants to revive, they are who kidnapped Akira and Medis as children,
For this reason Redias who was a priestess of the goddess Artesia, speaks of power and a great tragedy,
which occurred in the final battle of the Maian Hero of that time against the Evil God Icarus,
in that battle the world was practically destroyed.
In the end, they tells how the Future heroes will save the world and mention Felix Maian,
Akira Rainford, and about 5 others Heroes, all creations of the goddess Artesia to save the world.
Artesia Gaia___________Ruin Chaos____________Redias_______Icarus_____Maian________________Future Heroes