Getting Warhammered [WH 40k Fanfic]

In the bleak 41st millennium, a long-forgotten horror awakens, threatening to engulf the galaxy in perpetual darkness. Humanity's past arrogance is embodied in a dormant bioweapon of immense power, buried beneath the detritus of ages. A clandestine ritual, performed in the shadows of this era, aims to rouse this sleeping dread by forcibly linking it to a soul from another realm. This unholy union of advanced science and forbidden magic signals the start of an unparalleled disaster, poised to unleash the full, destructive power of Chaos upon an unprepared galaxy. From the ordinary world of 21st-century Earth, a young woman is violently torn from her life and thrust into an utterly alien reality. Transformed into a terrifying, unknown eldritch entity, she regains consciousness on a desolate planet, a solitary spark adrift in the immense, indifferent cosmos.