You will want momentum and igneous weapon on your bar for more passive damage.
The two hander has a passive called arcane fighter that will increase your chance to apply status effects like "burning". Take advantage of that by adding multiple types of damage to your build like poison and fire which can each provide a dot.
For the first half of the enemies health bar run Heavy attack > Molton whip while keeping unstable flame on. Once the enemy starts to get past half health switch to heavy attack > executioner.
That is as far I got on playing around with the 2 hander. Oh you may want volcanic rune to help you with those 3 mob pulls. Throw it down so it hits all three then charge in.
* Put flawless dawn breaker ultimate on your DPS bar and banner on your other bar. You are euiping it for the DPS passive it contains and because it charges fast if you need a quick battle roar stat heal.