Bone spirit necro S5 7.8b crit 

Glass cannon with all int gems. DPS is pretty nutty.
Boss killing build. Throw on doombringer for tankier setup and youll still get 4b crits.
For horde mobs I'll throw on doombringer, a ring with rapid ossification, and faster boots. Then when I get to the boss I'll switch to my burst dps gear and they melt in seconds.
The build is more reliable with rubys in gear. This was just for fun.