The only scout of the Order of Favonius is a Pyro 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 Amber.
Complete list of Materials used by Amber in Genshin Impact
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If you're looking to upgrade your Amber here is the complete list of the materials you'll have to farm to Ascend the character and her talents.