voila ce que j´ai trouvé sur gamefaq:
Skorm´s Bow is a very special weapon. It is the most powerful ranged weapon in
Fable. Getting it requires some precise timing, depending on whether or not
your character is Good or Evil. You simply go to the Darkwood Chapel of Skorm
and sacrifice someone who is ´Good´, such as the mercenary at The Temple of
Avo, or the mercenary in Oakvale. Basically you teleport back to Darkwood,
then travel back to Skorm´s Chapel. Here is where the hard part comes in; The
sacrifice should be done as close to 6:00 AM as possible. For those of you who
do not know, 6:00 AM on the Fable Clock is when Night is on the left side of
the line and Day is on the right side of the line, and the arrow is exactly
aligned with the line that separates Night and Day. The more Evil your
character is, the more precise you have to be with timing your sacrifice. If
done right, you will be presented with a load of Evil Points, and Skorm´s Bow.
There really is no one way to get Skorm´s Bow, but the way that worked for me
is what I just told you above. I made the sacrifice with a halfway evil
character, and I had to sacrifice it right on the dot at 6:00 AM. It takes a
few tries, so don´t give up. As for the idiots who keep emailing me with
stuff like " You dumbass, 6:00 is bull(Explicit Deleted) you stupid ass!",
and other things like " Your guide is teh su><zors".....I truly pity you, and
hope that you will soon grow up and gain some maturity. Then again, finding
someone on GameFAQs who IS mature, is like finding a $100 dollar bill on the
ground....rare, but when it does happen it makes you realize that all hope is
not lost.