Just want to help by saying that the ratio of abilities and posibilities is way unbalanced.
What you feated there costs way more shards than you can use in PvP at end game when everything is over in seconds.
http://aoc.yg.com/feat-planner?class=34 ... 13,1646-13Damage output is insane on this build, with 50% offhand chance and max dot's proc.
For non magic hits - cat's paw
Magical hits - lotus overload (passive)
And as for rest, simple grim + detonate+ Dww, the damage done by maximum armor decrease and maximum procs. of both poison and unholy passives with 50% ~ offhand chance is HUGE compared to the 10% combo increase feats (at max lvl) that represent damage of 40-50 max, As sin is rare that you can actually spam Gc or any other combo for that mater.