Sword of Truth

No evil character may have the Sword of Truth.
Add 1 to your Strength during battle.
If your attack roll is lower than your opponent’s attack roll, you may change your attack roll into a 6 result.

I was wondering if I could use it during Psychic Combat, I don't care about the bonus to my Strenght but I obviously the second ability would be very helpful in Psychic Combat.

No, you can't.

FAQ: Rage Talon - If a character defeats another character in psychic combat, can he use the Rage Talon's second ability so the character cannot use Armor to prevent the loss of life? - A.: No, the Rage Talon can only be used in battle.