Farming Lan Yan’s materials in could be a complicated task if you don’t know where to start, but the Anemo character introduced in Version 5.3 needs to be fully Ascended and upgraded before she is put into a proper team comp for her offensive and supporting abilities.
Lan Yan is a character from Liyue, confirmed for Version 5.3, alongside characters like Mavuika and the Pyro Traveler. Along with these units, Lan Yan is among the four new characters in 5.3, though she is rumored to be a 4-star unit while the rest are 5-stars.
While HoYoverse has yet to detail the role of Lan Yan, leaks about her have emerged with the beta tests for Version 5.3. The rumors show that Lan Yan will be a support unit capable of creating a shield with her Elemental Skill while also triggering Elemental Conversion to allow her shield to have increased DMG absorption from certain elements it interacts with, somewhat like the ability used by Chasca in , which has her fire projectiles of different elements at enemies.
Before you take advantage of Lan Yan's benefits, however, you should ensure you fully Ascend her. Ascending the character will require farming Lan Yan’s materials and, as an Anemo character, you can start off by gathering Vayuda Turquoise stones.
These are the Ascension materials used by all Anemo characters in the game. Vayuda Turquoise Slivers, Fragments, Chunks, and Gemstones can be farmed from bosses aligned to Anemo in some way.