Tess'har said:Carnifix --> probably a +3 at most bow that grants the brilliant energy enchantment to any arrows it fires, at most.
Maybe, but the brilliant energy abilitie doesn't apply to bows... so it must be the quiver...
Squire James said:I think it is a "Heartseeker Bow", which I've seen written up in a Dragon magazine once. It is essentially a Vorpal weapon that pierces hearts rather than cutting off heads. That seems to match the book accounts of the bow rather well.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.