Because doesn't he deserve the most painful bloxxing possible?
Information accurate as of 30/03/2013
Venomshank, contrary to characteristics of most shanks, is a massive sword covered in poison. It can be found in SFOTH IV and as a Limited U gear. Both versions deal 5 damage for touching, 10 for slash, and 20 for lunge.
Like other SFOTH IV swords, Venomshank has a passive ability. Anybody touched by the blade are inflicted by poison, losing 1/8 damage of their max healthfive times every 2.2 seconds, effectively countering any health buffs from the typical 100 health they spawn with originally.
Because Darkheart heals its user when it kills another player, it cancels out the poison's damaging effect. Therefore, Darkheart is considered to be Venomshank's weakness.
Venomshank also contains many characteristics similar to Firebrand, with a similar texture and length, as well as a lunge only ability.