Thanee, I suppose then that there are many different interpretations/versions of the sword.
How about this, the 4th lvl Paladin spell Holy Sword:
This spell transforms the caster's melee weapon into a powerful Holy Avenger, a specially blessed weapon that, when wielded by paladin, acts like a +5 holy weapon that dispels magic on hit.
I don't know the exact stats though (must be something like DC ?? on-hit: Dispel magic).