This is the build I use for Fort Aspenwood, and I can kill anything but block/evade stance rangers/warriors or shutdown mesmers (yeah, I can even kill warriors 1v1, of course, I'm nearly dead afterwards). The Kurzick build is fairly weaker though, but you'll never be caught if you decide to run, and no one can run from you.
For Luxon side:
15 Dagger mastery (11+1+3)
11 Critical Strikes (10+1)
8 Deadly Arts (7+1)
Golden Phoenix Strike
Horns of the Ox
Falling Spider
Twisting Fangs
Expunge Enchantments
Siphon Speed
Impale
Aura of Displacement (E)
For Kurzick side: This one is used for running amber, but you can still slaughter anyone who tries to stop you, and take out the mines solo 1 bowman at a time.
15 Dagger mastery (11+1+3)
11 Critical Strikes (10+1)
8 Shadow Arts (7+1)
Golden Phoenix Strike
Horns of the Ox
Falling Spider
Twisting Fangs
Dash
Dark Escape
Sprint
Aura of Displacement (E)
Fort Aspenwood build
Rikimaru
Trixz
For luxon I tink you should swap siphon speed for critical defenses or SR. But other then that it looks good.
Lambentviper
looks nice, but it also looks like every other assassin build i see on these forums -.- pve or otherwise