You disrupt fortune's weave, shifting it to give your allies a little more luck at the expense of one of your foes.

Encounter   ✦     Arcane, Weapon
Standard Action      Ranged weapon

Target: One creature

Attack: Charisma vs. Will

Hit: 2[W] + Charisma modifier damage. Until the end of your next turn, whenever the target makes an attack roll, you roll a d4 and subtract your roll from the target's attack roll. Until the end of your next turn, whenever an ally makes an attack roll against the target, you roll a d4 and add your roll to your ally's attack roll.

Virtue of Prescience: You roll a d6 instead of a d4 when modifying attack rolls.

Published in Arcane Power, page(s) 13.