Scourgebane

Scourgebane was a trinket that passively increased a paladin's stamina, and provided a 5-minute burst of attack power when dealing with undead and demons. It had a 30-minute cooldown and functioned as a weapon buff.

Scourgebane was created by interweaving a Putrid Vine through the fragments of many scourgestones to fortify them. As a former tool of the Scourge, it serves its owner against its will.

Source
This item was a quest reward from Ancient Evil.