Playing as a bard - almost always at about 170+ charisma, my Fear has never once failed on any mob that I've used it on.
So, from the song standpoint, it almost certainly has no bearing.. unless, of course, like many of the other detrimental songs, you need HIGHER Charisma for it to land.
However, Necromancers have similar experience with lower starting CHA (race/class) and loaded up with -CHA gear, so I'd wager based on that, it has no bearing whatsoever.
|