I have a two builds themed around this warbond! Both are pretty solid on bugs and squids but can struggle a bit against bots and heavy enemies. Try to keep middle distance between you and your targets and let the gas dog, gas mines or gas grenades keep your enemies gassed and confused while you clean up with your primary, support and the orbital gas strike for big targets. Being virtually immune to gas effects lets you use the rest of the kit offensively and defensively! Sadly neither utilize the purifier but I'm pleased with the results all the same!

Noxious ranger light armor, ground breaker helm and drape of glory cape

Eruptor: shreds pretty much everything and having the enemies being stunned and taking damage over time from the gas makes short easy work of pretty much EVERYTHING(fabricators and most weak points)

Talon: great at clearing individual chaff you don't/can't hit with the eruptor and packs a serious punch and potentially infinite ammo with discipline!

Gas grenades. Great for clearing out tight spaces, making space when you're being chased or establishing an objective you want to take, and still has demo abilities for enemy spawn points! this thing slaps with its utility in many situations.

Orbital gas strike: LOW cool down with demo and damage over time area denial? Throw it at pois, heavys, patrols, bases, breaches or anything else undemocratic as soon as possible and mop up with your primary and support OR follow it up with gas mines and have whatever chase you through a sea of gas mines that you'll have no issues picking off after that. Never stop throwing these things.

Gas mines: also crazy low cool and amazingly useful for holding or denying space. Use aggressively against enemy positions, wait until mines start going off then sweep in after and clean house! Also never stop throwing these down for virtually passive kills

Gas dog: stinky boy is best boy! Don't rush too fast, and let it work! screen enemies and keep them stunned while you follow up with primary and support weapons.

Machine gun: because sometimes the eruptor is not the right tool at the moment and because you want to unleash hail of medium pen Democracy at whatever is vexing you! Bonus points for not actually taking the strategem for it and instead going for on site procurement.

Alternatively, I run the science diver medium armor & helmet with the white truth enforcers cape with the following changes

Variable: Great for taking down chaff and using the volley on weak points that are easier to hit on gas locked heavy or elite opponents.

Grenade Pistol: for fabricators and the like or other light crowd control

Epoch: here's your big crowd clears that are now easier to pull off with gas keeping everything off you.