Warhammer: My Genes Are a Little Bit Too Cthulhu

[Warhammer 40K + Fourth-Dimensional Disaster + Cthulhu + Devouring]

After dying, a 23-year-old woman from Earth has her soul transported into the Warhammer 40K universe, where she becomes a forbidden bioweapon from the Dark Age of Technology. She awakens inside the cocoon of a Chaos ritual, reborn as a mass of tentacles with the ability to devour the genes of every species and evolve without limit.