Ah, Bloodstalker. This is the build that redefines “one-trick pony”. If you need anything other than single-target DPS on a raid boss, then this is probably not what you’ll use.
But when you can pull it off, it’s worth it. Bloodstalker will do more single-target damage than any other spec in the right circumstances.
At this point, you may be wondering “What is Bloodstalker?”. It’s the common nickname given to a hybrid Assassin/Riftstalker build, mainly because mixing the two soul names together wasn’t particularly appealing. Bloodstalker combines the powerful bleeds from Assassin with the crit and damage bonuses from Riftstalker’s teleports in order to maintain very high single-target DPS.