Handguards is a new Ascension Material(for Kamisato Ayaka) which can be farming in Inazuma. This guide will show you the locations of Handguards and easy to get in Inazuma .
Narukami Island
Kanazuka
If you have Kamisato Ayaka
you can sprint on the ocean (3-9)
Kujou Encampment
Yashiori Island
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Wuthering Waves
Zenless Zone Zero