Maria Campbell of the Astral Clocktower

Maria Campbell remembers an old life. A life bathed in blood. A fishing hamlet. A research hall of many floors and many patients. And a stranger who insisted on corpse-fishing... AKA, that fic where a grimdark DLC boss is reincarnated in fluffy otome-land and still acts like she's in a FromSoftware game. (Bloodborne/Hamefura post-Dark Souls setting crossover)