The Captain of the Fleet is an electro 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 Beidou.
Complete list of Materials used by Beidou in Genshin Impact
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bxakid
If you're looking to upgrade your Beidou here is the complete list of the materials you'll have to farm to Ascend the Electro Pirate and her talents.