Shadow Storm
Assassin Attack 1
Your tie to the Shadowfell calls on the living shadows around your foe, causing them to claw at it as you make your attack.
Melee weapon
Target: One creature
Attack: Dexterity vs. AC
Hit: 1[W] + Dexterity modifier damage, plus 1 damage for each creature adjacent to the target.
Level 21: 2[W] + Dexterity modifier damage, plus 2 damage for each creature adjacent to the target.
Shadow storm is a 1st level assassin at-will power.