This combo takes around 80-100% of someones HP, depending on your gear (i have extremely low item level and even only have one legendary and im one shotting people with 25k-28k health)
you need
Prey on the Weak - talent
Plunder Armor - honor talent
Thick of Thieves - honor talent
Saltwater Potion - you can buy on PvP vendors
Killing Spree - talent
All together in combo does 65% more damage.
If you manage to get the crit buff from roll the bones.....its a guarateed one shot.
combo:
Tricks of the Trade > Cheapshot > Plunder Armor + Saltwater Potion (macro) > Killing Spree
Have fun guys Nerf incoming or maybe its just weak at max lvl
The macro i use is:
/cast Plunder Armor
/use Saltwater Potion