The richest man in Mondstadt is a Pyro character and before unleashing his might on the enemy you will first need to upgrade the character a little. Here is the complete list of the materials needed for Diluc.
Complete list of Materials used by Diluc in Genshin Impact
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bxakid
If you're looking to upgrade your Diluc here is the complete list of the materials you'll have to farm to Ascend the character and his talents.