The clouds left by popping the zerg mobs from the lightning blitz are a glitch. And you seek to change them to remove them?
I donno if there’s a thread for this already, but as a psyker main, I ask you - please make this an option for graphics. I run a rtx 4080 and being able to see scores of mobs explode into purple clouds of smoke and red mist, is the most satisfying psyker gameplay I’ve had in a while. Please, don’t remove this.