Cursed Theory
"You can use the light elemental crystals to get stronger?" Walker knew that the mages and many other system users had a way to use the light elemental crystals. Even Alice could coax the elemental mana from the light elemental mana crystals to help her healing songs.
"Yes, we have ways to pull the light from them and enhance our bodies. It comes at the cost of the crystal because it makes it unstable. These weaker crystals are ideal for it since they are not as useful in other places." The flying light swordsman of the Rize empire knew well that they were limited.
While Walker didn't know it, the angels of the Rize empire had their own rankings inside of the general rankings from angel, to archangel, and higher. The angels within each elemental hall had their own standings that allowed them to have access to certain things.