Ancestor Module: You will need at least 10-15% Cooldown if possible. If not, you will need to drop an MP mod for Focus on Singular and/or Power Increase for Focus on Electric. You don't need to be at 90% CD, but it definitely helps popping your 2, 3, and 4 off at regular intervals. MP is definitely a great option if you get that + Skill Crit Damage + Cooldown, but I have found Singular + Crit Dmg+ Cooldown to be the best overall (based on what limited data numbers I can crunch in the lab.)
The rotation is such: Build up your plasma with 3rd before the round starts, then use your 4th on the first big crowd, pop your 1st, and blast away, auto reloading with your 3rd and popping off your 2nd for more (BIG) damage. When at the boss, pop your 4th, immediately pop your 2nd for Current Bonding, then blast off with 1st active and auto reload with 3rd. Super easy.
You should have at least 3 copies of Hammer & Anvil, each with a faction Core & Adjustment! The element can stay Electric, or you can switch to Chill for L.o.D, Toxic for L.o.I, or Electric for O.o.T.; I have had no issues staying Electric.
You can also switch out Shield Conversion module for either HP Conversion (for more MP at the cost of ~2k HP) or HP Amplification for much more survivability! I would suggest the later to use the build in Onslaught!
