Hundred Blades. Used to be this: hit your target twice and hit targets ajacent to your target twice too. Now it's a a "DPS buff" Where , when you hit your target (every time for x seconds, no limit on hits), you deal normal melee damage from your sword PLUS a little extra slashing damage (depend on attribute point level) in a different damage channel, AND adjacent foes are hit for that extra damage too.
In a way it's modern version is better. But the old version was cool when combined with the old version of splinter weapon too.