Been thinking after the latest episode. ever since that line from August introducing dragon gods and God Serena's unknown other 3 elements
Red: Purgatory
Orange: Lightning (the lightning he produced before the 4 GoI counterattack was orange)
Yellow: Gale (his breath attack was yellow tinted)
Green: Cavern
Light Blue: Sea King
Blue: ??
Purple: ??
White: ??
Ignia uses Fire DS, Mercuphobia uses Water DS so far we know, unless the dragon gods are just the avatar cycle (fire, water, earth, air) maybe the last 3 could be a variation of God Serena's last 3 elements. Especially the white dragon, that element interests me the most. I've seen that Void theory but dunno what color it would be