The Righteous effect found on items used to work, but a stealth change in Update 12 completely broke it. It is supposed to give you a stacking +2 attack bonus and +2 damage against evil-aligned monsters when using this weapon, but it does absolutely nothing. The good-aligned benefit still works.
I submitted a bug report as have several others and I want to make sure this gets on the Known Issues list. So come on developers, please let us know what is going on.
Evidence:
In the following picture on the latest Lamania build, I am facing the front side of the portal so there is no flanking bonus. The portal is evil-aligned. I am constantly running while attacking and my only relevant buff was Rage (not really even necessary). My total attack bonus is +11 + 2 from Righteous. So attack bonus SHOULD be +13. My absolute damage range assuming no crits possible is 7-16 + 2 from Righteous. So the real total SHOULD be 9-18 damage. Instead, my running attack bonus is stuck at +11, which is wrong. I am getting rolls of 8 damage, which is below the minimum, and I never roll more than 16 damage. Righteous is clearly broken:
EDIT: Oops I might have accidentally made the title too provocative but I'm unable to edit it now. Sorry!