The set up of the city so to speak was surprisingly bright even though the buildings were higher and the massive crystal flame walls would have blocked out light. However, with fire often brought light. Walker could sense some light mana, but he realized that the areas even lacking light mana were allowing him to see without using mana senses. The others also were able to see.
It made him wonder if there was a deeper connection to how fire mana worked at the very core of what it was. If there was some sort of origin to mana that allowed them to share some properties between elemental manas.
The idea was nothing new. Especially for those who knew that natural mana came from the unification and balance of elemental manas. The idea that original mana existed was also just a land of unproven theories which Walker might be able to prove even more later.
