[shatner]

CBM 1.92 has the following definition:

#selectitem "Thunder Bow"
#descr "When the string of the Thunder Bow is drawn, a lightning bolt will
appear where the arrow should have been, ready to be fired at the archer's
enemies. The further the string is drawn, the more powerful the lightning
bolt will be. The Thunder Bow can be a very formidable weapon in the hands
of a man with strong arms and a good eye."
#weapon 927
#end

#newweapon 927
#name "Thunder Bow"
#flyspr 210
#explspr 10241
#range 40
#ammo 24
#dmg 0
#magic
#armornegating
#shock
#aoe 1
#att 10
#sound 27
#end


Ulm Black Rose v0.282b MC edition has the following definition.
-Abomination Bane
#newweapon 947
#name "Abomination Bane"
#dmg 12
#att 5
#def 2
#len 3
#nratt 1
#twohanded
#magic
#dt_magic
#armorpiercing
#sound 8
#end

Mightypeon, are your definitions any different?