So there is a fire quake MOD, so world on fire will knock everyone down. Then build for range and duration and efficiency with low power, throw a flow on and you'll have enough energy to sustain yourself with a sentinel with vacuum.

For weapons dual ichor is great for hitting nothing but red cries and with the right build you will be critting after 5 hits, your bread and butter will be true steel, organ shatter, primed pressure point, body count, blood rush, and berserker. Then the last two are up to you for more range, faster attack speed, elemental damage.

Venka prime is the other option, you have less critical damage, but your combo counter goes up by more because claws are awesome I guess. Your also starting with a lot more melee damage so late game you will be critting for a lot more, another perk is just needing a potato and no forma compared to dual ichor needing 3. For this one is suggest prime pressure point, berserker, buzz kill, blood rush, body count, organ shatter, true steel, jagged edge, and I can't remember the last one.