Based on a composite longbow (+6)

Legacy traits:

level 5: +1 magic weapon

level 7: increased critical range

level 9: +2 to dex

level 10: Heartache (Book of Vile Darkness) three times per day as a ranged touch attack. DC 11+cha

The weapon of legacy known as Zerknirschtheit came to being when Drentch needlessly killed Nevyn (an ally) in gladiatorial combat. Caught up in the moment, Drentch failed to notice that Nevyn was close to death and delivered a killing blow with his composite longbow (+6).

Failing to raise Nevyn, Drentch provided for an elaborate memorial (2500gp) to remember Nevyn. Drentch’s ordinary longbow became Zerknirschtheit during this memorial.

The longbow took on aspects of Nevyn as well as the remorse Drentch felt at killing an ally needlessly.

(Omen) Those who score critical hits with Zerknirschtheit suffer nausea on the following round. The nausea lasts for that round only. Fort save (DC 25) to resist.

As one uses Zerknirschtheit, it becomes easir to score critical hits with it. The bearer also becomes more agile. Eventually, the remorse over the killing can be used as an attack on opponents.