Shade's pact blade
A shadowblade is a light blade with the light thrown property, a +3 proficiency bonus. It deals 1d8 damage, and has a range of 5/10.
Enhancement: +3 attack rolls and damage rolls
Critical: +3d6 damage
Property: This blade functions as a warlock implement and an assassin implement, adding its enhancement bonus to attack rolls and damage rolls for warlock and assassin powers that use implements.
Property: When a creature you have cursed with your Warlock’s Curse makes a melee attack against you, deal damage to the creature equal to the pact blade’s enhancement bonus.
Special: You do not gain your weapon proficiency bonus to the attack roll of a power that has the Implement keyword.