Grain of Aerosiderite is Weapon Ascension Materials used to ascend weapons, increasing the stats and max level. Higher-rarity materials can also be crafted with Alchemy by combining lower-rarity materials from the same group.
A black meteor once fell beyond Liyue’s Sea of Clouds, said to have fallen to vanquish a monster. However, it was stained by powerful tainted blood, so this item no longer possesses the pure power of Rex Lapis.
How To Get
Grain of Aerosiderite is obtainable as a random reward from completing the Hidden Palace of Lianshan Formula domain near Mingyun Village every Wednesday, Saturday, and Sunday. It can also be purchase from the souvenir shop in Liyue with Geo sigils.