What exactly was the Sun God's magic mirror like? As it was formerly God Equipment, would it have many miraculous uses? Actually, that wouldn't be meaningful at all to me.
To me, it was only one piece of the puzzle. All I needed from it was its Concept as a top-level light-type resource.
The main components of my planned Holy Light sword Dawn in my design were one foundational resource and two additional resources to help support its main abilities. The quality of the final resources I used in constructing my sword would directly affect the sword's final power level.
Back when I was locked in bitter battle in the Chaos Abyss against the Devil Lords, I had forcefully started creating my Holy Light sword. The foundational resource I chose for it was actually two items: Karolan's spear from before he had ascended to become the God of Holy Light and Estrada's battle hammer filled with the inheritance of Holy Knights.