Blood squall
rogue attack 19
Requirement: wielding a light blade.
Target: each enemy in burst you can see
Attack: Dexterity vs. AC
Hit: "2[W] + Dexterity modifier damage, and ongoing 10 damage (save ends)."
Miss: "Half damage, and no ongoing damage."[MP:83]
Blood squall is a daily power available to rogues at 19th level.