[quote=@Grey]
MoMN isn't that broken if you're fighting Servants with it. It's when you get a preemptive on Masters that it becomes an issue, but that's kind of the point for Assassin class so 

Also not exactly what you were asking for, but in keeping with the spirit of Murderer of the Misty Night, I'd personally think night in this case would just be sundown-sunrise. But to each their own.
[/quote]

At the moment I've tried arguing over the ability to attack a master. It seems to have come down to the fact of how prepared a master is.