Any suggestions for Wee Jas weapon relic?

[Vahktang]

Our hero, a 13 th level sword sage from book of nine swords, was nice enough to take a True Believer feat for Wee Jas.
I want to reward that sort of role playing with a religious relic.
The Ruby Blade from Magic Item Compendium makes it an Axiomatic weapon to those lawful and, with True Believer, turn undead 4 levels higher and cast the spell Status.
Not very good for a fighter type.
So, I'm looking for suggestions for a nice weapon religious relic.
If it's for another gawd, I can adapt it.

One suggestion I like is that it adds a martial manuever if you are lawful, and, with the TB feat, the next round after a hit, it adapts to that DR, even to piercing, blunt and slashing.
Too powerful?
And it doesn't seem all that exciting.

What say you all?

 

[DumbPaladin]

The "changes DR to match what it needs" modifier exists in Magic Item Compendium: it's a +2 bonus, and I don't think it's too powerful at all. In fact, it's awesome.

But since this is Wee Jas, maybe that ability only triggers under certain circumstances -- like against undead? Or against undead and chaotic creatures? This weakens it a bit, but it makes more sense given the deity's flavor.

I'd recommend a couple of other minor abilities that will prove helpful, but won't turn the weapon into anything insane.

-- Give the weapon the undead bane ability? (Always nice for a fighter.)
-- Allow the weapon to cast spark of life once per day upon a target? (Really nasty spell against undead: it essentially takes away their undead template, thus rendering them vulnerable to many, many things...)
-- Have the weapon grant your hero a Knowledge (Religion) or Intelligence or Wisdom check to ascertain a particular vulnerability of the enemy? Or if you want to be nicer, the weapon simply informs the hero of a particularly useful piece of information against an undead or chaotic creature he/she is fighting?