Crossover:
Presea Testarossa sends her unacknowledged daughter to hunt down a DIFFERENT set of Lost Logia/monsters in the pursuit of bringing her first daughter back to life.
There's a bit of initial difficulty in that Bardiche, magical damage and physical electricity are nearly useless against the targets, but after a few whippings and much investigation, Fate finds the blessed sword she needs to get the job done.
Arf and Bardiche grow increasingly concerned about the changes Fate undergoes after every kill, and become very alarmed when the changes become pronounced. Fate stubbornly ignores them both in her desperate quest for Presea's approval.
Presea herself actually gives Fate medical attention to make sure her tool doesn't break down from this unexpected infection before she gets the job done. Besides, the infection might be a forewarning of complications she'll need to deal with, should this method of resurrection work; Fate's condition merits study if just for that reason alone.
When the job is done and the monster is set free, however, Presea may find herself dealing with a problem she and the local priests can't contain.