The Oni Blades
Possibilities: 3 
(each)
(each)
Tapping Difficulty: 15
Purpose:
To strike down the wielder’s foes.
Description:
The Oni Blades are a matching pair of katanas (Damage: Strength +4, Armor Piercing 2.) One has red etchings of demons in the blade, and a hilt wrapped in red silk, while the other’s etchings and grip are blue.
Powers:
A character armed with either blade gains +3 Toughness against any melee weapon attack, or +5 Toughness when armed with both. Unarmed and ranged attacks aren’t affected. The wielder may spend a to reroll the katana’s 
. Always take the new result.
Restrictions:
The blades’ may only be spent to augment melee weapons skill tests or to reroll bonus damage with either katana. If the blades are wielded against one another by two opponents no powers may be used and the Tapping Difficulty increases to 30.
From Core Rules