I thought i would share my build so here it is: http://gw2skills.net/editor/?fZAQNAoaVlsMp7pdOxwJ8PNxORsdRwE3ndldlD-TFCBwAnVCiV5HgjYAt9HSpvhxDCQn6PBOFCBAQA4m38m7cn7sMA6jB-w
It’s a wvw build, alternative runes can be Scholar, Strength or Privateer (never tested these).
Swappabel traits:
Critical Strikes: Hidden killer can be swapped to Executioner.
Shadow arts: Cloaked in Shadows or Shadow’s Embrace can be swapped to Infusion of Shadow.
Acrobatics: Power of Inertia can be swapped to Fleet Shadow.