Does it only work on the Undead? The reason I ask is that in the description it says "Undead up to level 13 are set on fire and flee for 30 seconds" but I just watched a YT video where it was used on the residents of Whiterun and it set them on fire. So does it still cause fire damage to any enemy and what's the fire damage calculated at plus I take it that with the Undead it still burns above level 13 but they just don't flee above that level?

Anyone?

try it and find out. Should be plenty of forsworn nearby