Though players were introduced to Nilou in the first Sumeru patch, she didn't become playable until the following Genshin Impact's 3.1 patch. Released alongside fellow Hydro user Candace and Electro user Cyno, Nilou is a Hydro sword user and a five-star character.
Genshin Impact: Swift As The Wind Achievement Guide
Nilou is a skilled dancer, headlining the Sabzeruz Festival and playing an important role in Sumeru's Archon Quests. Players who want to use her in combat will do well to seek out the items and Mora listed in this guide, which are needed to ascend her and level up her talents.
Nilou is going to need as much EXP and Mora between each ascension level as any other character in the game. How much she needs is outlined in this table:
As a Hydro user, Nilou needs Varunada Lazurite to ascend. She'll also need everything else listed here:
This elemental gem is used by all Hydro character, including Nilou. It can be found in a few places, but most of it will likely come from bosses. The bosses capable of dropping Varunada Lazurite are:
For all sources of Varunada Lazurite, check this guide:
Genshin Impact: Where to Get Varunada Lazurite
The materials dropped by fungal enemies are used by Nilou in her ascension. Note that these items will be converted into the wrong ones if the enemy is hit with an Electro or Pyro attack, so be sure to avoid this if farming ascension materials for Nilou. The higher the level of the enemy, the better their drops can be:
Fungus monsters can be found in Sumeru, almost anywhere in the forested region. Some can also be found in the Chasm, though not in the same populations as Sumeru's rainforests.
The Perpetual Caliber item is a unique boss material. It is dropped by the Aeonblight Drake, a boss that
Read more on gamerant.com