Warhammer: The Emperor's Daughter, a Rose in the Abyss

[Warhammer + gender-bender + alternate Horus Heresy] Qin Yi accidentally transmigrates to the Warhammer World and becomes the mysterious Second Primarch, the only daughter beneath the Golden Throne. He is the Emperor's prototype Primarch, the one into whom the Emperor and Erda poured the most power. But that immense power overwhelmed the original soul. Now, the original soul has been replaced by him. She is a rose in the abyss: resilient and beautiful, yet bearing deadly thorns. But those thorns can wound her, too.