Genshin Impact: Becoming a Harbinger in Snezhnaya

Ming Qiu suddenly died and arrived in Teyvat. After wandering for a while, he caught the eye of The Jester and became a Fatui Harbinger. He also possessed a Cryo Vision, the ability to summon powerful familiars, and talents that let him avoid the backlash of using a Delusion. He faithfully collected Gnoses to serve the Tsaritsa.

Story revision: Phanes created four shades to maintain the world: the Ruler of Life, the Ruler of Death, the Ruler of Time, and the Ruler of Space. But unknown to all, Phanes also created another shade of their own. Khaenri'ah’s technology and the power of the Abyss shook this shade’s faith in upholding the laws of heavenly principles. It betrayed those laws, and after its rebellion failed, it lost its original appearance and power. Reduced to a lingering soul that people could not see, it wandered the land of Teyvat until, five hundred years later, it made a pact with Ming Qiu, a transmigrator from beyond this world, to continue its resistance against the heavenly principles!

The heroine should be a young girl.