Daunting barrage
rogue attack 19
Requirement: wielding a crossbow, a light thrown weapon, or a sling.
Target: each enemy in blast you can see
Attack: Dexterity vs. AC
Hit: "3[W] + Dexterity modifier damage, and the target is dazed (save ends)."
Miss: "Half damage, and the target is not dazed."[MP:83]
Daunting barrage is a daily power available to rogues at 19th level.
It is a good choice, due to the dazing effect and improved damage in addition to the rattling keyword. [Char-op rogue]