Astral Sun Fragment

Astral Sun Fragment is a material that can be acquierd by defeating The Unblemished Trio. This is one of the three fragments you can get from that boss-fight, the others being the Molten Moon Fragment and the Lunar Star Fragment.

Astral Sun Fragment is a very cold material that can be used to craft enumerous items, one being the Rune of Sol, the summoning item of Flawless, God of the Sun.

The description of this item reads as follows: "A cold peace of the former sun."

Craftable Items
Rune of Sol

Blade of the Former Sun

(Add your own items here if you want!)

Trivia

 * The idea for the Astral Sun Fragments, Molten Moon Fragments and Lunar Star Fragments came from the part of me that wanted The Unblemished Trio to be one of the final bosses in the game. Adding this materials makes the part of me that wants this boss to be the final one happy, and they work, so it's all good!