Spring from the Shadows 
Feat 12FlourishRogueSource Core Rulebook pg. 188 2.0Archetype Shadowdancer*
* This archetype offers Spring from the Shadows at a different level than displayed here.
Leaping out from hiding, you assail your target when they least expect it. You Stride up to your Speed, but you must end your movement next to an enemy you’re hidden from or undetected by. You then Strike that enemy; you remain hidden from or undetected by that creature until after you Strike. You can use Spring from the Shadows while Burrowing, Climbing, Flying, or Swimming instead of Striding if you have the corresponding movement type.
Archetype Use
This feat can be used for one or more Archetypes in addition to the listed Classes. When selected this way, the feat is not considered to have its class traits.
Traits
Flourish: Flourish actions are actions that require too much exertion to perform a large number in a row. You can use only 1 action with the flourish trait per turn.