Instructions
Hire a mercenary -- these are commonplace in Albion.
Use your Guild Seal to lead it to the Temple of Skorm.
Hire another mercenary and lead it back to the Temple of Skorm using your Guild Seal.
Monitor your time/day meter and wait until it is midnight, which is when the dark half of the monitor is at the top of the meter and the light half of the meter is at the bottom. Execute one of the mercenaries to receive the Bow. If it does not appear, execute the other immediately to increase your "evil points."