SRD:Holy Avenger

Holy Avenger: This +2 cold iron longsword becomes a +5 holy cold iron longsword in the hands of a paladin.

It provides spell resistance of 5 + the paladin’s level to the wielder and anyone adjacent to her. It also enables the wielder to use greater dispel magic (once per round as a standard action) at the class level of the paladin. (Only the area dispel is possible, not the targeted dispel or counterspell versions of greater dispel magic.)

Strong abjuration; CL 18th; Craft Magical Arms and Armor, holy aura, creator must be good; Price 120,630 gp; Cost 60,630 gp + 4,800 XP.