The mysterious woman who supposedly works for the Civil Affairs Bureau, Yelan is an Hydro character and before unleashing her might on the enemy you will first need to upgrade the character a little. Here is the complete list of the materials needed for Yelan.
Complete list of Materials used by Yelan in Genshin Impact
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bxakid
If you're looking to upgrade your Yelan here is the complete list of the materials you'll have to farm to Ascend the character and her talents.