I have one called a Bow of Exorcism. And another called a Bow of Dragon Slaying .
Apparently they are worthless?
Not really worthless....for the avid bow collecter, such as yours truely, they are a part of any archers collection.
About your bow, is it black in color??....If not, fetch a gear from the tinker shop. Have a fletcher double click the bow then target the gear. You should get a nice double slayer.
Now if it is black, then it's still a good bow for hunting the daemons.
I recently bought a bow of daemon dismissal, 250k....because.....it wasn't enhanced yet with gears....in turn, I got me a nice Bow of daemon dismissal/daemon/dragon slayer.
These puppies put out 2X the damage.