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Skip the rock
rogue attack 1

Requirement: wielding a sling

Target: one creature

Attack: Dexterity vs. AC

Hit: "1[W] + Dexterity modifier damage. Make a secondary attack.

"Secondary Target: One creature within 10 squares of the primary target
"Secondary Attack: Dexterity vs. AC
"Hit: Dexterity modifier damage, and the secondary target is dazed until the end of your next turn.

"Cunning Sneak: The secondary attack deals extra damage equal to your Intelligence modifier."[MP2:59]

Skip the rock is an encounter power available to rogues at 1st level.