Sul'thraze the Lasher

Sul'thraze the Lasher is a two-handed sword that procs a strength debuff and additional Shadow damage on the target.

Prior to Patch 4.0.3a, this item required level 50, which caused it to be commonly skipped over for items such as Ice Barbed Spear. With it now requiring level 44, this item now much more practical for both PvP and leveling.

Source
Sul'thraze the Lasher is created by combining two rare swords from Zul'Farrak, and, using Call of Sul'thraze.