The keen blade of white steel brings send a chill to the bones of any struck by it

Critical: +1d6 Cold damage
Enhancement: +1 attack rolls and damage rolls
Power (At-Will * Cold): Free Action. All damage dealt by this weapon is cold damage. Another free action returns the damage to normal
Power (Daily * Cold): Free Action. Use this power when you hit with the weapon. The target takes 1d8 cold damage and is slowed until the end of your next turn.