The Grimling Bane Weapons from Shar Vahl is what happens when the Development team has a wake and bake. Beastlords don't have 1HS, a Greatsword that is a 2HB despite the fact that all other greatswords are 2HS. The completely unbalanced items. Someone just wasn't thinking when they made these weaps.
The Great Sword of Grimling Slaying (which is a 2hb, go figure?) has a better ratio and a proc. Higher dmg is to be expected of a Great Sword over a short sword, granted but why not give all of these weapons an effect?
Besides, the Centi Shortsword isn't that expensive, has better dmg/dly and some usable stats.