Talk:Nightingale/@comment-36.81.16.204-20160330132916/@comment-146.185.31.218-20160331030312

@taitu nope. "Servants placed within this class are always Heroic Spirits who have gone berserk during battle at least once in their lifetime." - taken from Wikia.

there's always some criteria before a servant can be called to a certain class, the Aria only helped you to spesifically call for a zerker, like how Heracles are eligible to all class except Caster but using the Aria he can be summonned as Zerker without fail. if the servant is incompatible probably that servant won't be show up as zerker, or at least got low ME, there's no such precedent before, so I'm not sure(of the result).

the reason I rant here cuz no such story of Florence Nightigale gone berserk before, hence I need some explanation why she's summonned in the zerker class, not the Ruler class (since you know, she's the one who set the basic rule of nursery) which has been answered