If you've played Well of Radiance Warlock from D2 this build intent holds a lot of similarities. The Gamma Burst Anointment's are very strong and FL4k can always have there Action Skill up. While This build isn't the best for DPS it has some of the best serviceability. I try to look for a lot of AOE items. Love this for group play.
Mobbing: Pestilence, Brain Stormer, Rowens Call, Kyb's Worth, Krakatoa, Storm, Fire Storm, Moonfire, Devils Foresome,
Bossing: Cuttsman, Flakker, King's/Queens Call, Scourge.
ALL: Breath of the Dying, Conference call, The Dictator, Lob.
Shield: The Transformer, Red Suit, Version 0.m, Stop Gap, Back Ham.
Class Mod: Red Fang with +1 to "He Bites!"
Grenade: It's Piss, Hex, Lingering purple nades can work
Relic: Victory Rush, Snow Drift, Elemental Projector, Otto Idle.
Anointment's: Grenade Throw DMG, Attack Command Move speed, Gamma Burst Radiation, Attack Command Life steal , Consecutive Hits.
For those who own DLC
Mobbing: Lucky 7, Slow Hand, Scovile
All: iOn Cannon