Arkhium

In Genshin Impact, Arkhium is a special mineral closely related to the energy sources of the Fontaine region. It appears in two forms: Arkhium Stock and Arkhium Lumenite. Arkhium Stock is automatically formed by collecting seven Mysterious Ores scattered throughout Fontaine. After collecting them, players need to go to the Bravais Forging Press, where they will complete a series of puzzles and operations to forge the Arkhium Stock into Arkhium Lumenite. Arkhium Lumenite is a key item used to unlock hidden rooms in specific areas of the Fontaine region, which contain treasure chests and some in-game achievements.