Genshin Impact: Kamisato Ayato's Ascension Materials Farming Guide

gamespot.com:

Kamisato Ayato, Yashiro Commissioner and Ayaka's older brother, is a new hydro sword character in Genshin Impact. Like all Genshin characters, getting him up to level 90 requires dedicated farming. Ayato would be a great main DPS on teams, so if he is your main damage dealer, leveling him up to 90 would be ideal. If he's not your main DPS, level 80 is good enough. For newer players, almost all of Ayato's ascension materials are locked behind the Inazuma area. You will also need to have Raiden's Act II Story Quest unlocked, which is pretty far into the game. Below is a guide to which materials--and how much of each--you'll need.

You can find a limited amount of Varunada Lazurite in Souvenir Shops. The following normal boss fights also drop «hydro shards:» Hydro Hypostasis, Rhodeia of Loch, and Primo Geovishap (if infused with hydro). The weekly bosses that drop Varunada Lazurite are Stormterror, Azhdaha, and Childe. For farming Ayato's Varunada Lazurite, I suggest doing the Hydro Hypostasis since you'll need to hit the same boss for his other ascension material, Dew of Repudiation.

Sakura Blooms can only be found in the main Inazuma island. For a convenient single-farm location, the Grand Narukami Shrine has a lot of Sakura Blooms around it--26 to be exact. Make sure to have an electro character in your party when farming for Sakura Blooms. You can also use the Teyvat Interactive Map to plan your farming routes.

Handguards are dropped by Nobushi and Kairagi enemies in the open world, including Old Handguards by enemies of any level, Kageuchi by 40+ level enemies, and Famed by 60+ level enemies. You can find Nobushi enemies scattered all across Inazuma, but the most efficient single location is Jinren Island--nearest