Here it is.
Vexing Weapon Level 5+ Rare
This bludgeon weapon is enchanted by dreadmasters for service to their loyalist and can both draw and refocus the dark priest radiance and necrotic arcane energies.
Weapon: two-handed mace group
Allies of this weapon’s weilder with arcane proficiency with a mace can use this vexing weapon’s wielder’s square as the point of origin of ranged implement keyword attacks and doing so doesn’t provoke opportunity attacks by the wielder.
When the wielder of the weapon moves or shifts into an adjacent square of an enemy; then until the end of that turn the adjacent enemy grants combat advantage to the wielder.
Power (Fear) Encounter (Free Action)
Effect: Wielder of this vexing weapon shifts or move into an adjacent square of enemy and make a melee attack against that enemy with this weapon, on the hit target is shift 1 and knock prone.
Power (Radiance, Necrotic, Implement) Consumable (Immediate Interrupt)
Trigger: This weapon’s wielder is reduced to 0 hps.