i just made this build and it made me happy in FA
[build prof=necromancer/assassin blood=12+2+1 soul=12+1 shadow=3] [Vampiric bite][vampiric touch][signet of agony][angorodon's gaze][life transfer][death's charge][well of blood][demonic flesh][/build]
template: OAdTQYD/HqGiTISoR0PA3hLQQAA
equipment: Pk5BiMz6TDeMpKSFyEHZYnyEHZH4QsEJN6xEHpncyEFpYB
just watch this kill ranger shrines and turtles pretty fast (as long there is no healing ^^)
energy sometimes is a problem so try to keep up bleeding on yourself with signet of agony to get energy from angorodon's gaze
in FA the well of blood is just freaking nice for area heals. (read regeneration ^^) but in other cases it would prob be better to bring a speed buff, since the build is based on biting some1's throat.