Combat Saturday - Double Sword Double sword Prof. +3; Damage d8/d8; Range —; Cost 40 gp; Weight 9 lb.; Group Heavy blade, Light blade; Properties Defensive, off-hand.
This is an exotic weapon from D&D 4e. Wielding a double weapon is like wielding a weapon in each hand. The first die given in the damage column of the table for a double weapon is for the primary (or main) end of the weapon; the second damage die is for the secondary (or off-hand) end. You can use either end of a double weapon to deliver an attack unless a power specifies a main or off-hand weapon attack. An enchanted double weapon receives an enhancement bonus on both ends, but weapon properties or powers conferred by the enchantment affect only the primary end of the weapon. Like two-handed weapons, double weapons cannot normally be wielded by Small creatures unless the weapon has the small property. The source for this is the Adventurer's Vault https://www.dmsguild.com/product/110209/Adventurers-Vault-4e?term=adventurer%27s+vault